CAT Ratios Bible Top 10 Must Solve Ratios Questions covering 90% of Syllabus – Page 4
All 40 Ratios questions from CAT papers. Tap Show answer, or open the detailed solution (free login). Page 4 of 11.
A mixture P is formed by removing a certain amount of coffee from a coffee jar and replacing it with cocoa powder. The same process is repeated to form mixture Q. If the ratio of coffee and cocoa in the mixture Q is 16:9, then the ratio of cocoa in mixture P to that in mixture Q is:
Answer: B. 5/9
Solution — first steps
Using the given information and performing the replacements, the final ratio of cocoa in mixture P to Q is 5/9.
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Arvind travels from town A to town B, and Surbhi from town B to town A, both starting at the same time along the same route. After meeting each other, Arvind takes 6 hours to reach town B while Surbhi takes 24 hours to reach town A. If Arvind traveled at a speed of 54 km/h, then the distance, in km, between town A and town B is:
Answer: D. 972 km
Solution — first steps
The total distance between town A and B, given the speeds and time taken, is 972 km.
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The salaries of three friends Sita, Gita and Mita are initially in the ratio 5 : 6 : 7, respectively. In the first year, they get salary hikes of 20%, 25% and 20%, respectively. In the second year, Sita and Mita get salary hikes of 40% and 25%, respectively, and the salary of Gita becomes equal to the mean salary of the three friends. The salary hike of Gita in the second year is
Answer: A. 26%
Solution — first steps
Step 1. Take initial salaries as5,6,7 units.
Step 2. After year1 they become6,7.5,8.4.
Step 2. After year1 they become6,7.5,8.4.
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The amount of job that Amal, Sunil and Kamal can individually do in a day, are in harmonic progression. Kamal takes twice as much time as Amal to do the same amount of job. If Amal and Sunil work for 4 days and 9 days, respectively, Kamal needs to work for 16 days to finish the remaining job. Then the number of days Sunil will take to finish the job working alone, is
Answer: 27
Solution — first steps
Step 1. Let daily rates be a,s,k. Since Kamal takes twice Amal's time, k=a/2.
Step 2. Rates are in harmonic progression, so their reciprocals 1/a,1/s,1/k are in arithmetic progression.
Step 2. Rates are in harmonic progression, so their reciprocals 1/a,1/s,1/k are in arithmetic progression.
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Anil mixes cocoa with sugar in the ratio 3 : 2 to prepare mixture A, and coffee with sugar in the ratio 7 : 3 to prepare mixture B. He combines mixtures A and B in the ratio 2 : 3 to make a new mixture C. If he mixes C with an equal amount of milk to make a drink, then the percentage of sugar in this drink will be
Answer: D. 17
Solution — first steps
Step 1. Mixture A has sugar fraction 2/5; mixture B has sugar fraction 3/10.
Step 2. They are combined in ratio 2:3, so sugar fraction in C is [2(2/5)+3(3/10)]/5.
Step 2. They are combined in ratio 2:3, so sugar fraction in C is [2(2/5)+3(3/10)]/5.
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Last day solving checklist
- Name the unknown. Include its unit and state whether it is a count, amount, rate or parameter.
- Form the relationships. Translate each given condition into an equation or restriction.
- Choose the method. Use the formula, substitution, elimination, a sign chart or a bound appropriate to this concept.
- Check restrictions. Check integer counts, signs, nonzero denominators, domains and all original conditions.
- Verify the answer. Substitute into the original question; for an extreme, show a feasible example reaches it.
All 14 repeating CAT PYQs and how much each adds
| CAT PYQ | Repeating CAT PYQ | Questions | Representative | Cumulative questions | Cumulative share |
|---|---|---|---|---|---|
| 1 | Work rate ratios and individual contributions | 12 | CAT 2021 S1 Q19 | 12 | 20.69% |
| 2 | Mixture ratios replacement and dilution | 8 | CAT 2021 S1 Q11 | 20 | 34.48% |
| 3 | Income payroll and savings on a common scale | 5 | CAT 2021 S1 Q17 | 25 | 43.10% |
| 4 | Unit prices equivalent costs and trading ratios | 5 | CAT 2021 S1 Q3 | 30 | 51.72% |
| 5 | Speed time length and meeting ratios | 5 | CAT 2021 S2 Q5 | 35 | 60.34% |
| 6 | Investment shares interest and returns | 5 | CAT 2021 S2 Q8 | 40 | 68.97% |
| 7 | Subgroup counts with different percentages | 4 | CAT 2021 S2 Q7 | 44 | 75.86% |
| 8 | Geometric side angle and altitude ratios | 3 | CAT 2022 S2 Q1 | 47 | 81.03% |
| 9 | Stock and population ratios after transfers | 3 | CAT 2024 S1 Q1 | 50 | 86.21% |
| 10 | Allocate a conserved total among groups | 3 | CAT 2023 S2 Q16 | 53 | 91.38% |
| 11 | Integer multiplier and divisibility of ratios | 2 | CAT 2022 S1 Q8 | 55 | 94.83% |
| 12 | Price ratio with a product condition | 1 | CAT 2021 S3 Q17 | 56 | 96.55% |
| 13 | Recover group size ratio from averages | 1 | CAT 2022 S1 Q20 | 57 | 98.28% |
| 14 | Age ratios with a constant difference | 1 | CAT 2024 S2 Q22 | 58 | 100% |
Based on CAT Actual Quant Papers.