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MBA CET 2025 Slot 6 question paper with solutions

200 questions · Quantitative Aptitude 50 · Verbal Ability 50 · Logical Reasoning 75 · Abstract Reasoning 25. Tap Show answer on any question for the answer and Cetking's solution.

Q101EasyTime Speed Distance
Two trains P and Q start simultaneously in the opposite direction from two points A and B and arrive at their destinations 25 and 16 hours respectively after their meeting each other. At what speed does the second train Q travel if the first train travels at 100 km/h?
  1. 100
  2. 125
  3. 120
  4. 140
  5. 115
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Answer: B

Approach: Trains meeting rule: SP/SQ = √(tQ/tP), where t = time taken after meeting.

Solution:
Time of P after meeting tP = 25 h; time of Q after meeting tQ = 16 h.
SP/SQ = √(16/25) = 4/5
100/SQ = 4/5 ⇒ SQ = 100 × 5/4 = 125 km/h

Cetking shortcut: The train that takes LESS time after meeting is FASTER — so Q > 100; only 120, 125, 140, 115 qualify, and √(25/16) = 5/4 gives 125.

Answer: B

Q102EasyAges
The sum of present ages of Anish, Ajay and Anvit is 75 years. If 5 years ago the ratio of their ages was 3:4:5. What is the present age of Ajay?
  1. 65
  2. 28
  3. 32
  4. 44
  5. 25
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Answer: E

Approach: Ages with a past ratio — add the years back to each part.

Solution:
5 years ago: Anish = 3x, Ajay = 4x, Anvit = 5x.
Present ages: 3x+5, 4x+5, 5x+5 ⇒ sum = 12x + 15 = 75 ⇒ 12x = 60 ⇒ x = 5.
Ajay now = 4x + 5 = 20 + 5 = 25 years.

Cetking shortcut: Sum 5 years ago = 75 − 15 = 60; Ajay's share = 4/12 × 60 = 20; add 5 ⇒ 25.

Answer: E

Q103EasyTime Speed Distance
Amit cycled from his house to the garden at speed of 12 km/hr and cam back to his house at the speed of 6 km/hr. if the total time taken by Amit to complete the journey was 6 hours, then find the distance between Amit's House and garden?
  1. 32
  2. 28
  3. 24
  4. 36
  5. 40
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Answer: C

Approach: Distance = Speed × Time; same distance both ways.

Solution:
Let one-way distance = D km.
Time going = D/12, time returning = D/6.
D/12 + D/6 = 6 ⇒ (D + 2D)/12 = 6 ⇒ 3D = 72 ⇒ D = 24 km.

Cetking shortcut: Average speed for equal distances = 2×12×6/(12+6) = 8 km/h; total distance = 8 × 6 = 48 km, one way = 24 km.

Answer: C

Q104EasyProbability
What is the probability of getting a red numbered card greater than 6 from a well shuffled deck of 52 cards?
  1. 4/13
  2. 2/13
  3. 5/13
  4. 3/13
  5. 6/13
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Answer: B

Approach: Probability = favourable cards / 52.

Solution:
Red suits: hearts and diamonds (13 each).
Numbered cards greater than 6: 7, 8, 9, 10 ⇒ 4 per suit.
Favourable = 4 × 2 = 8 ⇒ P = 8/52 = 2/13.

Why the other options are wrong:
A 4/13: counts all four suits (16 cards).
C, D, E: include face cards or the 6 itself.

Cetking shortcut: Per suit 4 of 13 cards qualify; red = half the deck ⇒ (4/13) × (1/2) = 2/13.

Answer: B

Q105EasyProbability
A bag contains 10 black balls 5 red balls and 5 white balls and a ball is drawn randomly from it. what is the probability of getting either a red or a white ball.
  1. 1/4
  2. 1/2
  3. 3/4
  4. 1
  5. 4/5
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Answer: B

Approach: Addition rule for mutually exclusive events.

Solution:
Total balls = 10 + 5 + 5 = 20.
Red or white = 5 + 5 = 10.
P = 10/20 = 1/2.

Cetking shortcut: P(red or white) = 1 − P(black) = 1 − 10/20 = 1/2.

Answer: B

Q106MediumPnC
In how many ways can the word “ESPECIALLY “ be arranged such that all the vowels always come together?
  1. 42600
  2. 25200
  3. 10080
  4. 30240
  5. 29242
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Answer: D

Approach: Vowels together: tie the vowels into one block, divide by repeats.

Solution:
ESPECIALLY = E, S, P, E, C, I, A, L, L, Y (10 letters).
Vowels: E, E, I, A (4); consonants: S, P, C, L, L, Y (6, L repeated).
Units to arrange = 1 vowel block + 6 consonants = 7 ⇒ 7!/2! = 2520 (2! for the two Ls).
Inside the block: 4!/2! = 12 (2! for the two Es).
Total = 2520 × 12 = 30240.

Why the other options are wrong:
B 25200, C 10080: forget one of the repeat divisions or the block's internal arrangement.
A, E: no standard method gives them.

Cetking shortcut: Answer must be divisible by 7!/2! = 2520 — only 25200, 10080 and 30240 are; 2520 × 12 = 30240.

Answer: D

Q107MediumProfit Loss
The market value of a share is 35% of the face value and 30% less than the selling price. find the profit or loss percentage
  1. 50% loss
  2. 50% profit
  3. 49% profit
  4. 48% loss
  5. 45% profit
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Answer: A

Approach: Percent-of chain: fix Face Value = 100 and convert each statement.

Solution:
Let Face Value (FV) = ₹100 ⇒ Market Value (MV) = 35% of 100 = ₹35.
MV is 30% less than SP ⇒ MV = 0.70 × SP ⇒ SP = 35/0.70 = ₹50.
Taking FV as the cost (the share was bought at par), loss = 100 − 50 = ₹50.
Loss % = 50/100 × 100 = 50% loss.

Why the other options are wrong:
B 50% profit: sign reversed — SP (50) is below cost (100).
C, D, E: arithmetic slips; no route gives 49%, 48% or 45%.

Cetking shortcut: SP = 35/0.7 = 50 = half the face value ⇒ 50% loss straight away.

Answer: A

Q108MediumNumbers
it was sunday on 12 february. 1882 what was the day on 12 february 1885?
  1. Wednesday
  2. Thursday
  3. Friday
  4. Saturday
  5. Sunday
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Answer: B

Approach: Odd days: each ordinary year adds 1 odd day, a leap year adds 2 — but only if its 29 February falls inside the interval.

Solution:
12 Feb 1882 → 12 Feb 1883: no 29 Feb in between ⇒ 1 odd day.
12 Feb 1883 → 12 Feb 1884: 29 Feb 1884 comes AFTER 12 Feb 1884 ⇒ 1 odd day.
12 Feb 1884 → 12 Feb 1885: includes 29 Feb 1884 ⇒ 2 odd days.
Total = 1 + 1 + 2 = 4 odd days ⇒ Sunday + 4 = Thursday.

Why the other options are wrong:
A Wednesday: only 3 odd days (ignores the leap day).
C Friday: 5 odd days — counts the leap day twice or counts 1884 from 1 Jan.
D, E: wrong count.

Cetking shortcut: 3 years apart = 3 odd days + 1 for every 29 Feb crossed (only 29 Feb 1884) = 4.

Answer: B

Q109EasyMensuration
The outer rolling surface of eight similar small rollers having a radius of 9 cm and length as 12 cm are to be painted at a rate of Rs 15 /cm.what will be the total cost of painting ( in Rs) ?
  1. 80788.7
  2. 80488.7
  3. 81280.5
  4. 81388.8
  5. 82487.2
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Answer: D

Approach: Curved surface area of a cylinder = 2πrh; cost = area × rate (π = 3.14, which the options are built on).

Solution:
CSA of one roller = 2 × 3.14 × 9 × 12 = 678.24 cm².
CSA of 8 rollers = 678.24 × 8 = 5425.92 cm².
Cost = 5425.92 × 15 = ₹81388.8.

Why the other options are wrong:
With π = 22/7 the cost is ≈ ₹81463 — not offered, so the paper clearly uses π = 3.14.
A, B, C, E: do not match 216π × 8 × 15 for any standard π.

Cetking shortcut: Cost = 2πrh × 8 × 15 = 25920π; 25920 × 3.14 = 81388.8.

Answer: D

Q110EasyMensuration
A courtyard is 30 meters long and 20 meters broad and is to be paved with bricks of dimensions 15cm by 10 cm what will be the number of bricks required?
  1. 25000
  2. 30000
  3. 40000
  4. 35000
  5. 42000
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Answer: C

Approach: Number of tiles = area of floor / area of one tile (same units).

Solution:
Courtyard area = 30 m × 20 m = 600 m².
Brick = 15 cm × 10 cm = 0.15 m × 0.10 m = 0.015 m².
Number of bricks = 600 / 0.015 = 40000.

Cetking shortcut: Work in cm: (3000 × 2000)/(15 × 10) = 200 × 200 = 40000.

Answer: C

Q111EasyInterest
A man invested X rupees for Y years at a rate of 3.25% per annum simple interest. if he received 3.25 X after Y years find the value of Y?
  1. 68.22
  2. 67.32
  3. 65.33
  4. 69.23
  5. 71.32
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Answer: D

Approach: Simple interest: SI = P × R × T / 100, with SI = Amount − Principal.

Solution:
Amount = 3.25X ⇒ SI = 3.25X − X = 2.25X.
2.25X = X × 3.25 × Y / 100 ⇒ 225 = 3.25Y.
Y = 225 / 3.25 = 69.23 years.

Why the other options are wrong:
Using SI = 3.25X (forgetting to subtract principal) gives 100 — not an option; A, B, C, E are calculation slips.

Cetking shortcut: Y = (Amount/P − 1) × 100 / R = 2.25 × 100 / 3.25 = 900/13 ≈ 69.23.

Answer: D

Q112EasyMixtures
A mixture containing 43% of acid is mixed with another mixture containing 82% acid in the ratio 10:9.find the percentage of acid in the mixture formed?
  1. 60.45%
  2. 61.25%
  3. 64.25%
  4. 63.2%
  5. 61.47%
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Answer: E

Approach: Weighted average (alligation) of concentrations.

Solution:
Acid % = (43 × 10 + 82 × 9)/(10 + 9)
= (430 + 738)/19 = 1168/19 = 61.47%.

Why the other options are wrong:
A 60.45%, B 61.25%, C 64.25%, D 63.2%: arithmetic slips; 62.5% would be the simple average, which ignores the 10:9 weights.

Cetking shortcut: Answer must be slightly below the simple average 62.5% (more of the weaker mixture): 43 + 39 × 9/19 = 43 + 18.47 = 61.47%.

Answer: E

Q113EasyTrains Boats
Two trains cross each other at a speed of 70 KMPH and 50 KMPH respectively. if the total length of both the trains is 1500 m find the time in which they cross each other the trains were moving in opposite direction?
  1. 43 second
  2. 41 second
  3. 45 second
  4. 49 second
  5. 42 second
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Answer: C

Approach: Trains in opposite directions: relative speed = sum of speeds; distance = sum of lengths.

Solution:
Relative speed = 70 + 50 = 120 km/h = 120 × 5/18 = 100/3 m/s.
Distance to cover = 1500 m (total length).
Time = 1500 ÷ (100/3) = 45 s.

Why the other options are wrong:
Using the difference of speeds (20 km/h) gives 270 s — not offered; A, B, D, E are slips.

Cetking shortcut: 1500 × 18/(120 × 5) = 1500 × 3/100 = 45 s.

Answer: C

Q114EasyTrains Boats
The speed of the stream is 25 KMPH the speed of the boat downstream is 15 m/s. find the speed of the boat in Still water?
  1. 8.06
  2. 6.05
  3. 5.23
  4. 7.05
  5. 8.56
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Answer: A

Approach: Downstream speed = boat speed + stream speed (same units).

Solution:
Stream = 25 km/h = 25 × 5/18 = 6.944 m/s.
Downstream = 15 m/s ⇒ boat in still water = 15 − 6.944 = 8.056 ≈ 8.06 m/s.

Why the other options are wrong:
E 8.56, D 7.05, B 6.05, C 5.23: arithmetic or conversion slips.

Cetking shortcut: Convert 15 m/s to km/h: 54 km/h; boat = 54 − 25 = 29 km/h = 29 × 5/18 = 8.06 m/s.

Answer: A

Q115MediumTime Speed Distance
the speeds of A,B and C are 15 m/s, 67 Kmph and 1020 m/ minute. if they start running in the same direction find the maximum difference between any two of them after 8 hours 30 minutes and 39 seconds.
  1. 111.399 km
  2. 112.289 km
  3. 109.243 km
  4. 108.221 km
  5. 110.606 km
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Answer: E

Approach: Gap between two runners in the same direction = (difference of speeds) × time; max gap is between fastest and slowest.

Solution:
Speeds in m/s: A = 15; B = 67 × 5/18 ≈ 18.61; C = 1020/60 = 17.
Fastest = B, slowest = A ⇒ speed difference = 18.61 − 15 = 3.61 m/s.
Time = 8 h 30 min 39 s = 30600 + 39 = 30639 s.
Maximum gap = 3.61 × 30639 ≈ 110606.8 m ≈ 110.606 km (rounding the speed to 3.61 m/s; the unrounded 3.6111 gives 110.64 km, still closest to E).

Why the other options are wrong:
Ignoring the 39 seconds gives ≈ 110.47 km — not offered.
A, B, C, D: other pairs/slips; B−C and C−A gaps are far smaller (≈ 49 km and ≈ 61 km).

Cetking shortcut: Only the fastest-minus-slowest pair matters: 3.61 m/s × 30639 s.

Answer: E

Q116MediumTime & Work
5 men or 7 women can do a piece of work in 28 days. find the time required by 7 men and 5 women to complete the task?
  1. 9 days
  2. 13 days
  3. 11 days
  4. 12 days
  5. 10 days
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Answer: B

Approach: Convert men and women to a common efficiency unit.

Solution:
5 men ≡ 7 women (both finish in 28 days) ⇒ 1 man = 7 units/day, 1 woman = 5 units/day.
Total work = 5 × 7 × 28 = 980 units.
7 men + 5 women per day = 49 + 25 = 74 units.
Time = 980 / 74 ≈ 13.24 days ⇒ about 13 days.

Why the other options are wrong:
A 9, C 11, D 12, E 10 days: all are further from 13.24 than 13 is; no other reading of the data gives them.

Cetking shortcut: Express everything in women: 7M + 5W = 9.8W + 5W = 14.8W; days = 7 × 28/14.8 ≈ 13.24.

Answer: B

Q117EasyPipes and Cisterns
Two pipes can fill a tank in 10 minutes together if the efficiency of the first pipe is 8 times the efficiency of the second pipe find the time required to fill the tank using the second pipe alone.
  1. 88 minutes
  2. 87 minutes
  3. 89 minutes
  4. 90 minutes
  5. 93 minutes
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Answer: D

Approach: Efficiency method for pipes.

Solution:
Efficiency ratio first : second = 8 : 1 ⇒ together 9 units/min.
Tank = 9 × 10 = 90 units.
Second pipe alone = 90 / 1 = 90 minutes.

Cetking shortcut: Second pipe does 1/9 of the joint rate ⇒ takes 9 × 10 = 90 minutes.

Answer: D

Q118MediumPartnership
Find the ratio of investment of Ajay to Vijay if Ajay invests after 6 months of Vijay's investment and Vijay invests after 3 months of commencement of business. It is known that their profit-sharing ratio after 1 year of commencement of business is 2:3.
  1. 2 : 1
  2. 1 : 3
  3. 3 : 1
  4. 1: 2
  5. 4 : 1
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Answer: A

Approach: Partnership: profit share ∝ capital × time.

Solution:
Vijay joins after 3 months ⇒ invests for 12 − 3 = 9 months.
Ajay joins 6 months after Vijay (month 9) ⇒ invests for 3 months.
A × 3 : V × 9 = 2 : 3 ⇒ 3A × 3 = 2 × 9V ⇒ 9A = 18V ⇒ A : V = 2 : 1.

Why the other options are wrong:
D 1:2: inverts the ratio.
B, C, E: wrong durations (e.g. 6 months for Ajay).

Cetking shortcut: Capital ratio = profit ratio ÷ time ratio = (2/3) ÷ (3/9) = 2 ⇒ 2 : 1.

Answer: A

Q119EasyMixtures
A mixture contains milk and water in a ratio of 7:11. When 7 liters of water is added, the ratio changes to 7:13. Find the quantity of milk in the initial mixture.
  1. 23.5
  2. 24.8
  3. 22.4
  4. 24.5
  5. 25.3
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Answer: D

Approach: Milk stays constant when water is added.

Solution:
Initially milk = 7x, water = 11x.
After adding 7 L water: 7x/(11x + 7) = 7/13 ⇒ 91x = 77x + 49 ⇒ 14x = 49 ⇒ x = 3.5.
Milk = 7 × 3.5 = 24.5 L.

Cetking shortcut: Milk part fixed at 7; water goes 11 → 13, so 2 parts = 7 L ⇒ 1 part = 3.5 L ⇒ milk = 24.5 L.

Answer: D

Q120EasyProfit Loss
The cost price of an article is twice the discount. if the discount is 40% of the selling price find the profit or loss percent
  1. 25% loss
  2. 25% profit
  3. 20% loss
  4. 20 % profit
  5. 30% profit
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Answer: B

Approach: Assume SP = 100 and translate each statement.

Solution:
Discount = 40% of SP = ₹40.
CP = 2 × discount = ₹80.
Profit = 100 − 80 = ₹20 ⇒ Profit % = 20/80 × 100 = 25% profit.

Why the other options are wrong:
D 20% profit: divides profit by SP instead of CP.
A, C: SP is above CP, so it cannot be a loss.
E: arithmetic slip.

Cetking shortcut: CP = 0.8 × SP ⇒ SP/CP = 5/4 ⇒ 25% profit.

Answer: B

Q121MediumPercentages
There are 1450 cars in the factory. The factory produces 8 cars hourly. If the sales of the factory are 80 cars per day, what will be the sale percentage to the total cars held by the factory after 7 days. It is known that the factory runs 8 hours daily.
  1. 28.6%
  2. 27.5%
  3. 29.5%
  4. 24.54%
  5. 26.74%
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Answer: C

Approach: Percentage of sales to total cars held (opening stock + production) over 7 days; the garbled hourly figure is 8 cars.

Solution:
Production = 8 cars/hour × 8 hours = 64 cars/day ⇒ 7 days = 448 cars.
Total cars held in 7 days = 1450 + 448 = 1898.
Cars sold in 7 days = 80 × 7 = 560.
Sale % = 560/1898 × 100 = 29.5%.

Why the other options are wrong:
With 6 cars/hour (doc's reading) the figures give 31.35% (sales/1786) or 45.68% (sales/closing stock) — neither is an option, so 6 is not the intended value.
A 28.6%, B 27.5%, D 24.54%, E 26.74%: correspond to non-integer hourly production (≈ 9.1, 10.5, 14.9, 11.5 cars) — not sensible.

Cetking shortcut: Back-solve: 560/0.295 ≈ 1898 ⇒ production = 448 = 7 × 64 = 7 × 8 × 8 — a clean 8 cars/hour, so C.

Answer: C

Q122EasyRatios
There are two children named p and q . If it is known that the ages of p and q are in a ratio of 4:20. and the sum of their ages is 10 years and 6months. Find the age of q
  1. 5 years
  2. 8 years
  3. 4 years
  4. 7 years
  5. 6 years
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Answer: B

Approach: Ratio split of a total.

Solution:
p : q = 4 : 20 = 1 : 5.
Sum = 10 years 6 months = 10.5 years ⇒ 6 parts = 10.5 ⇒ 1 part = 1.75.
q = 5 × 1.75 = 8.75 years = 8 years 9 months.

Why the other options are wrong:
Only B (8 years) carries q's age in whole years; A 5, C 4, D 7, E 6 years do not fit 5/6 of 10.5.

Cetking shortcut: q = 5/6 × 10.5 = 8.75 ⇒ 8 years (9 months).

Answer: B

Q123EasyAverages
The average runs scored by 3 players is 160 per match. Their runs are in a ratio 4:6:2. What will be the average it the player who scored the minimum runs hits a century in the next match and the other two play with the same runs?
  1. 160.5
  2. 166.66
  3. 162.5
  4. 168.5
  5. 162.5
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Answer: B

Approach: Average = total runs / number of players; recompute the total for the next match.

Solution:
Total runs per match = 3 × 160 = 480; ratio 4 : 6 : 2 (12 parts) ⇒ 160, 240, 80.
Next match: lowest scorer (80) scores 100; the other two score the same 160 and 240.
New total = 160 + 240 + 100 = 500.
Average for the match = 500/3 = 166.66.

Why the other options are wrong:
C/E 162.5, A 160.5, D 168.5: none equals 500/3; combining both matches (980/6 = 163.33) is not what is asked and is not an option either.

Cetking shortcut: Only the lowest scorer changes by +20 ⇒ average rises by 20/3 = 6.66 ⇒ 160 + 6.66 = 166.66.

Answer: B

Q124EasyNumbers
One-third of the sum of all prime numbers greater than two but less than 20 is the square of which number?
  1. 5
  2. 6
  3. 7
  4. 8
  5. 9
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Answer: A

Approach: List the primes, add, divide by 3, take the square root.

Solution:
Primes greater than 2 and less than 20: 3, 5, 7, 11, 13, 17, 19.
Sum = 75 ⇒ one-third = 25 = 5².

Cetking shortcut: One-third must be a perfect square: 25, 36, 49… ⇒ sum 75, 108, 147…; the sum of odd primes below 20 is 75 ⇒ 5.

Answer: A

Q125EasyEquations Basics
Village P has a population of 78000 which is decreasing at the rate 1800 per year. Village Q has a population of 54000, which is increasing at the rate of 600 per year. in how many years will the population of the two villages be equal?
  1. 14
  2. 15
  3. 10
  4. 12
  5. 13
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Answer: C

Approach: Equate the two linear population expressions.

Solution:
P after x years = 78000 − 1800x.
Q after x years = 54000 + 600x.
78000 − 1800x = 54000 + 600x ⇒ 24000 = 2400x ⇒ x = 10 years.

Cetking shortcut: Gap 24000 closes at 1800 + 600 = 2400 per year ⇒ 10 years.

Answer: C

Q126EasySimplification
What is the value of (26+(42(23-20) + 2-(2(5*80-100))+16-4))?
  1. -434
  2. 434
  3. -443
  4. -453
  5. 435
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Answer: A

Approach: BODMAS — innermost brackets first.

Solution:
23 − 20 = 3 ⇒ 42 × 3 = 126.
5 × 80 − 100 = 300 ⇒ 2 × 300 = 600.
Inside: 126 + 2 − 600 + 16 − 4 = −460.
26 + (−460) = −434.

Why the other options are wrong:
B 434: sign error.
C −443, D −453, E 435: arithmetic slips.

Cetking shortcut: Sign check: −600 dominates ⇒ answer must be negative, leaving only A, C, D.

Answer: A

Q127EasyAlgebra
Find the value of 2a³-[3a³+4a²-{2a³-7a³}+5a³-7a²]
  1. -11a³+3a²
  2. 7a²+3a³
  3. 11a³-3a²
  4. -11a³-3a²
  5. 11a³-2a²
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Answer: A

Approach: Remove brackets from the innermost outward, flipping signs after a minus.

Solution:
{2a³ − 7a³} = −5a³ ⇒ −{…} = +5a³.
Inside [ ]: 3a³ + 4a² + 5a³ + 5a³ − 7a² = 13a³ − 3a².
2a³ − [13a³ − 3a²] = 2a³ − 13a³ + 3a² = −11a³ + 3a².

Why the other options are wrong:
C 11a³ − 3a²: whole sign reversed.
D −11a³ − 3a²: forgets to flip the a² sign.
B, E: wrong coefficients.

Cetking shortcut: Put a = 1: 2 − [3 + 4 + 5 + 5 − 7] = 2 − 10 = −8; only A gives −11 + 3 = −8.

Answer: A

Q128EasyEquations Basics
A drum of kerosene is ¾ full. When 50 liters of kerosene is drawn from it, it remains 11/16 full, What is the capacity of the drum?
  1. 900
  2. 750
  3. 800
  4. 850
  5. 875
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Answer: C

Approach: Fraction removed × capacity = quantity drawn.

Solution:
3/4 − 11/16 = 12/16 − 11/16 = 1/16 of the drum.
1/16 × capacity = 50 L ⇒ capacity = 800 L.

Cetking shortcut: Drop in fraction = 1/16 ⇒ 16 × 50 = 800.

Answer: C

Q129EasyEquations Basics
Sujit and Suraj each have some money. If Sujit gives Rs. 10 to Suraj, then Suraj will have twice the money left with Sujit. But, if Suraj gives Rs. 10 to Sujit, then they both have an equal amount of money. How much money does Sujit have?
  1. Rs 70
  2. Rs 80
  3. Rs 60
  4. Rs 50
  5. Rs 40
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Answer: D

Approach: Form two linear equations from the two exchanges.

Solution:
Let Sujit = S, Suraj = R.
Suraj gives ₹10 ⇒ equal: S + 10 = R − 10 ⇒ R = S + 20.
Sujit gives ₹10 ⇒ R + 10 = 2(S − 10) ⇒ S + 30 = 2S − 20 ⇒ S = 50.
Check: R = 70; 70 + 10 = 80 = 2 × 40 ✓.

Why the other options are wrong:
A ₹70: that is Suraj's money.
B, C, E: fail the checks.

Cetking shortcut: Test options: S = 50 ⇒ R = 70 ⇒ 80 vs 40 ✓ twice.

Answer: D

Q130MediumSimplification
Find the value of 0.081³+0.009³+0.002187*0.09
  1. 0.000729
  2. 0.00729
  3. 0.0000729
  4. 0.0729
  5. 0.729
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Answer: A

Approach: Identity (a + b)³ = a³ + b³ + 3ab(a + b) with a = 0.081, b = 0.009.

Solution:
3ab = 3 × 0.081 × 0.009 = 0.002187 and a + b = 0.09.
So 0.081³ + 0.009³ + 0.002187 × 0.09 = a³ + b³ + 3ab(a + b) = (a + b)³.
(0.09)³ = 0.000729.

Why the other options are wrong:
B, C, D, E: same digits 729 with the decimal misplaced — (0.09)³ has 6 decimal places.

Cetking shortcut: Spot 0.002187 = 3 × 0.081 × 0.009 and 0.09 = 0.081 + 0.009 ⇒ cube of 0.09.

Answer: A

Q131EasyEquations Basics
A sum of Rs 8.75 is made up of 105 coins, which are of either 10 paise or 5 paise. How many 5 paise coins are there?
  1. 40
  2. 38
  3. 37
  4. 39
  5. 35
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Answer: E

Approach: Two-variable coin equation (or alligation on coin values).

Solution:
₹8.75 = 875 paise. Let 10-paise coins = x ⇒ 5-paise coins = 105 − x.
10x + 5(105 − x) = 875 ⇒ 5x + 525 = 875 ⇒ x = 70.
5-paise coins = 105 − 70 = 35.

Cetking shortcut: If all 105 were 5-paise: 525 p; extra 350 p comes from 10-paise coins at 5 p each ⇒ 70 of them ⇒ 35 five-paise coins.

Answer: E

Q132EasyHCF LCM
Find the HCF of 405, 585, 765, 900
  1. 45
  2. 90
  3. 35
  4. 15
  5. 50
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Answer: A

Approach: HCF = product of common primes with lowest powers.

Solution:
405 = 3⁴ × 5; 585 = 3² × 5 × 13; 765 = 3² × 5 × 17; 900 = 2² × 3² × 5².
Common: 3² × 5 = 45.

Why the other options are wrong:
B 90: 405 is odd, so 2 cannot be a factor.
C 35: 7 does not divide any.
D 15: a common factor, but not the highest.
E 50: 405 is not divisible by 2 or 25.

Cetking shortcut: Check options from the largest: 90 fails (405 odd), 50 fails, 45 divides all four ⇒ 45.

Answer: A

Q133EasyHCF LCM
Akshay has completely put each of three liquids, 558 liters of petrol, 682 liters of diesel and 589 liters of kerosene in bottles of equal size without mixing with any of the above three types of liquids such that each bottle is completely filled. What is the least possible number of bottles required?
  1. 56
  2. 59
  3. 63
  4. 66
  5. 60
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Answer: B

Approach: Largest equal bottle size = HCF of the volumes; bottles = sum of volumes ÷ HCF.

Solution:
558 = 2 × 3² × 31; 682 = 2 × 11 × 31; 589 = 19 × 31 ⇒ HCF = 31 L.
Bottles = 558/31 + 682/31 + 589/31 = 18 + 22 + 19 = 59.

Cetking shortcut: Differences 682 − 589 = 93 = 3 × 31 and 589 = 19 × 31 point straight to 31; total 1829/31 = 59.

Answer: B

Q134EasyHCF LCM
Three runners, Harshad, Aniket, and Rajesh, running around a circular track can complete one revolution in 12, 18 and 24 minutes respectively. After how many minutes will they meet at the starting point?
  1. 70
  2. 73
  3. 75
  4. 72
  5. 76
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Answer: D

Approach: Meeting again at the start = LCM of individual lap times.

Solution:
12 = 2² × 3; 18 = 2 × 3²; 24 = 2³ × 3.
LCM = 2³ × 3² = 72 minutes.

Cetking shortcut: Check multiples of 24: 24, 48, 72 — 72 is the first divisible by 18.

Answer: D

Q135MediumHCF LCM
Three wheels can complete 25, 21 and 16 revolutions per minute respectively. There is a red spot on each wheel that touches the ground at time zero. After how much time, all these spots will simultaneously touch the ground again?
  1. 58 second
  2. 60 second
  3. 62 second
  4. 59 second
  5. 61 second
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Answer: B

Approach: Spots touch the ground together after the LCM of the time per revolution; LCM of fractions = LCM(numerators)/HCF(denominators).

Solution:
Time per revolution: 1/25, 1/21, 1/16 minute.
LCM = LCM(1, 1, 1)/HCF(25, 21, 16) = 1/1 = 1 minute = 60 seconds.

Why the other options are wrong:
A 58, C 62, D 59, E 61 s: none is a whole number of revolutions for all three wheels (e.g. in 59 s the 25-rpm wheel turns 24.58 times).

Cetking shortcut: In 1 minute every wheel completes a whole number of turns (25, 21, 16); 25, 21, 16 share no common factor, so nothing shorter works.

Answer: B

Q136EasyHCF LCM
If X,Y & Z are three numbers such that LCM of X & Y is X and LCM of Y & Z is Y then find the HCF of X, Y and Z
  1. X
  2. Y
  3. Z
  4. XY
  5. YZ
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Answer: C

Approach: LCM(a, b) = a means b divides a.

Solution:
LCM(X, Y) = X ⇒ Y is a factor of X.
LCM(Y, Z) = Y ⇒ Z is a factor of Y.
So Z | Y | X ⇒ Z divides all three and is the largest such number ⇒ HCF = Z.

Why the other options are wrong:
A X, B Y: X and Y do not divide Z (unless equal).
D XY, E YZ: an HCF cannot exceed the smallest number.

Cetking shortcut: Try numbers: X = 12, Y = 6, Z = 3 ⇒ HCF = 3 = Z.

Answer: C

Q137EasyNumbers
how many prime numbers are less than 100?
  1. 20
  2. 22
  3. 24
  4. 25
  5. 23
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Answer: D

Approach: Count primes below 100 decade by decade.

Solution:
1–10: 2, 3, 5, 7 (4); 11–20: 11, 13, 17, 19 (4); 21–30: 23, 29 (2); 31–40: 31, 37 (2); 41–50: 41, 43, 47 (3);
51–60: 53, 59 (2); 61–70: 61, 67 (2); 71–80: 71, 73, 79 (3); 81–90: 83, 89 (2); 91–100: 97 (1).
Total = 4 + 4 + 2 + 2 + 3 + 2 + 2 + 3 + 2 + 1 = 25.

Cetking shortcut: Fact to memorise: 25 primes below 100 (and 168 below 1000).

Answer: D

Q138EasySequences and Series
Find the sum of first 100 even natural numbers
  1. 10100
  2. 11020
  3. 10080
  4. 10050
  5. 10070
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Answer: A

Approach: Sum of first n even natural numbers = n(n + 1).

Solution:
2 + 4 + … + 200 = 2(1 + 2 + … + 100) = 2 × 100 × 101/2 = 100 × 101 = 10100.

Why the other options are wrong:
D 10050: uses n(n+1)/2 × 2 wrongly or 100 × 100.5.
B, C, E: arithmetic slips.

Cetking shortcut: n(n + 1) = 100 × 101 = 10100.

Answer: A

Q139MediumFactors
In how many ways the number 3234 can be written as the product of 2 numbers which are coprime to each other?
  1. 7
  2. 9
  3. 8
  4. 10
  5. 11
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Answer: C

Approach: Number of ways to write N as a product of two co-prime factors = 2k−1, k = number of distinct primes of N.

Solution:
3234 = 2 × 3 × 7² × 11 ⇒ distinct primes: 2, 3, 7, 11 ⇒ k = 4.
Each prime power must go wholly to one factor ⇒ 2⁴ = 16 ordered splits.
Unordered pairs = 16/2 = 8 (including 1 × 3234).

Why the other options are wrong:
B 9, D 10, E 11: overcount; A 7: excludes the pair 1 × 3234, which is co-prime.

Cetking shortcut: Just count distinct primes: k = 4 ⇒ 2³ = 8.

Answer: C

Q140EasySimplification
Given that 1²+3²+5²+7²+9²=165, then what is the value of 3²+9²+15²+21²+27²?
  1. 1485
  2. 1385
  3. 990
  4. 495
  5. 995
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Answer: A

Approach: Scaling: every term is 3 times an odd number, so each square is 9 times.

Solution:
3² + 9² + 15² + 21² + 27² = 3²(1² + 3² + 5² + 7² + 9²)
= 9 × 165 = 1485.

Why the other options are wrong:
D 495: multiplies by 3 instead of 9.
C 990: multiplies by 6.
B, E: slips.

Cetking shortcut: Factor out 3² = 9 ⇒ 9 × 165 = 1485.

Answer: A

Q141EasyAlgebra
Find the square root of 4a²+9b²+c²+12ab-6bc-4ac
  1. 2a + b – 3c
  2. 2a – 3b - c
  3. 2a – 3b – c
  4. 2a + 3b – c
  5. 2a + b – 2c
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Answer: D

Approach: Match with (x + y + z)² = x² + y² + z² + 2xy + 2yz + 2zx.

Solution:
Square terms give 2a, 3b, c (signs to fix).
+12ab = 2(2a)(3b) ⇒ 2a and 3b have the same sign.
−4ac = 2(2a)(−c) and −6bc = 2(3b)(−c) ⇒ c has the opposite sign.
So the expression = (2a + 3b − c)² ⇒ square root = 2a + 3b − c.

Why the other options are wrong:
B / C 2a − 3b − c: would make the ab term −12ab.
A 2a + b − 3c, E 2a + b − 2c: squares give b², not 9b².

Cetking shortcut: Only the sign pattern matters: ab positive, ac and bc negative ⇒ c alone is negative ⇒ D.

Answer: D

Q142EasyAlgebra
If X +Y+Z= 0 then what is value of (x+y) (y+z) (x+z)?
  1. X²+ Y²+ Z²
  2. (X+ Y + Z) ²
  3. -XYZ
  4. XYZ
  5. (X+Y+Z) ³
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Answer: C

Approach: Use x + y + z = 0 to replace each pair sum by the negative of the third.

Solution:
x + y = −z, y + z = −x, x + z = −y.
(x + y)(y + z)(x + z) = (−z)(−x)(−y) = −xyz.

Why the other options are wrong:
D xyz: misses one minus sign (three negatives give a negative).
A, B, E: B and E are 0 here; A is unrelated.

Cetking shortcut: Take x = 1, y = 1, z = −2: (2)(−1)(−1) = 2 and −xyz = 2 ✓.

Answer: C

Q143EasyNumbers
How many number are there between 55 and 3815 which are multiple of 5 and divisible by 3?
  1. 249
  2. 250
  3. 251
  4. 252
  5. 238
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Answer: C

Approach: Multiples of 5 and 3 = multiples of LCM 15; count terms of the AP.

Solution:
First multiple of 15 above 55 = 60; last below 3815 = 3810 (15 × 254).
Count = (3810 − 60)/15 + 1 = 250 + 1 = 251.

Why the other options are wrong:
B 250: forgets the +1.
D 252: includes an extra end term.
A 249, E 238: slips.

Cetking shortcut: ⌊3815/15⌋ − ⌊55/15⌋ = 254 − 3 = 251.

Answer: C

Q144EasySequences and Series
The sum of three numbers in AP is 48. The sum of their squares is 800. Find the smallest number among following.
  1. 10
  2. 12
  3. 11
  4. 9
  5. 13
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Answer: B

Approach: Three numbers in AP: take them as a − d, a, a + d.

Solution:
Sum = 3a = 48 ⇒ a = 16.
Sum of squares = 3a² + 2d² = 800 ⇒ 768 + 2d² = 800 ⇒ d² = 16 ⇒ d = 4.
Numbers: 12, 16, 20 ⇒ smallest = 12.

Why the other options are wrong:
A 10 ⇒ 10, 16, 22: squares sum 840.
C 11, D 9, E 13: squares sum 818, 866, 786 — not 800.

Cetking shortcut: Middle term = 48/3 = 16; test options: 12, 16, 20 ⇒ 144 + 256 + 400 = 800 ✓.

Answer: B

Q145EasySimplification
Find the product of 968427 and 3493
  1. 3382715511
  2. 3382715523
  3. 3382756879
  4. 3328778965
  5. 3357729673
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Answer: A

Approach: Last-digit check, then a rough size check.

Solution:
Units digit: 7 × 3 = 21 ⇒ product ends in 1 ⇒ only A (…511) qualifies.
Size check: 968427 × 3493 ≈ 9.68 × 10⁵ × 3.49 × 10³ ≈ 3.38 × 10⁹ ✓.
Exact: 968427 × 3493 = 3382715511.

Why the other options are wrong:
B …523, C …879, D …965, E …673: wrong units digit.

Cetking shortcut: Units digit 7 × 3 → 1 eliminates every option except A.

Answer: A

Q146EasyRemainders
on dividing 30879 by a certain number the question is 67 and the remainder is 327. find the divisor
  1. 476
  2. 456
  3. 466
  4. 444
  5. 457
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Answer: B

Approach: Dividend = Divisor × Quotient + Remainder.

Solution:
30879 = 67 × d + 327.
67d = 30879 − 327 = 30552.
d = 30552/67 = 456 (remainder 327 < 456 ✓).

Why the other options are wrong:
A 476, C 466, D 444, E 457: 67 × each + 327 ≠ 30879 (e.g. 67 × 457 + 327 = 30946).

Cetking shortcut: Units digit: 67 × d must end in 2 (…879 − …327) ⇒ 7 × d ends in 2 ⇒ d ends in 6: options 476, 456, 466 — then 30552/67 = 456.

Answer: B

Q147MediumRemainders
Find remainder when 354¹⁷⁶- 346¹⁷⁶ is divided by 700.
  1. 5
  2. 0
  3. 2
  4. 4
  5. 3
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Answer: B

Approach: aⁿ − bⁿ is divisible by (a + b) when n is even.

Solution:
n = 176 is even ⇒ 354¹⁷⁶ − 346¹⁷⁶ is divisible by 354 + 346 = 700.
Remainder = 0.

Why the other options are wrong:
A, C, D, E: non-zero remainders are impossible since 700 divides the expression exactly.

Cetking shortcut: Spot 354 + 346 = 700 and the even power ⇒ remainder 0 instantly.

Answer: B

Q148MediumFactorials
How many factors of 19! Are there, whose units digits is 5?
  1. 1298
  2. 1296
  3. 1295
  4. 1297
  5. 1291
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Answer: B

Approach: A factor ends in 5 ⇔ it is odd and a multiple of 5. Count factors with power of 2 = 0 and power of 5 ≥ 1.

Solution:
19! = 2¹⁶ × 3⁸ × 5³ × 7² × 11 × 13 × 17 × 19 (powers: 3 → ⌊19/3⌋ + ⌊19/9⌋ = 8; 5 → 3; 7 → 2).
Choices: 2 → 1 (only 0); 3 → 9; 5 → 3 (1 to 3); 7 → 3; 11, 13, 17, 19 → 2 each.
Count = 1 × 9 × 3 × 3 × 2 × 2 × 2 × 2 = 1296.

Why the other options are wrong:
A, C, D, E: off by small amounts — usually from including 5⁰ (gives 1728) or miscounting the power of 3.

Cetking shortcut: Odd part of 19! has (8+1)(3+1)(2+1)·2⁴ = 1728 factors; drop the 5⁰ ones (1/4) ⇒ 1728 × 3/4 = 1296.

Answer: B

Q149EasyNumbers
What number will replace A if 3313A is divisble by 33?
  1. 4
  2. 5
  3. 2
  4. 6
  5. 8
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Answer: C

Approach: Divisible by 33 ⇔ divisible by 3 and by 11.

Solution:
Divisibility by 11: alternating sum of 3, 3, 1, 3, A = 3 − 3 + 1 − 3 + A = A − 2 ⇒ A = 2.
Divisibility by 3: 3 + 3 + 1 + 3 + 2 = 12 ✓.
Check: 33132 = 33 × 1004 ✓.

Why the other options are wrong:
A 4, D 6: digit sums 14, 16 — fail divisibility by 3.
B 5, E 8: pass the 3-test but fail the 11-test.

Cetking shortcut: Apply the stricter 11-test first — it fixes A = 2 in one line.

Answer: C

Q150EasyFactors
which of the following divides 3⁴⁵+ 3⁴⁶ + 3⁴⁷ + 3⁴⁸ + 3⁴⁹
  1. 3
  2. 5
  3. 2
  4. 11
  5. 4
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Answer: A

Approach: Take out the common factor 3⁴⁵.

Solution:
3⁴⁵ + 3⁴⁶ + 3⁴⁷ + 3⁴⁸ + 3⁴⁹ = 3⁴⁵(1 + 3 + 9 + 27 + 81) = 3⁴⁵ × 121 = 3⁴⁵ × 11².
So the sum is divisible by 3 (every term is a power of 3).

Why the other options are wrong:
B 5, C 2, E 4: the sum is odd and has no factor 5 (3⁴⁵ × 11² only).
D 11: also divides the sum (121 = 11²), so two options are valid; A is the stored key.

Cetking shortcut: Factor 3⁴⁵ out ⇒ 3⁴⁵ × 121: prime factors are only 3 and 11.

Answer: A

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