Here’s an example: If x, y, and k are positive numbers such that [x/(x+y)]*10 + [y/(x+y)]*20 = k and if …

## Critical Reasoning involving rates

Let’s look at an question and convince you of the right answer: The faster a car is traveling, the less …

## Difficult questions using basic concepts

It may seem like we will need trigonometry to handle this question, but that is not so. In fact, the …

## Circular Arguments in Critical Reasoning

Consider this argument: Anatomical bilateral symmetry is a common trait. It follows, therefore, that it confers survival advantages on organisms. …

## Ratios in Data Sufficiency

We know that ratios are the building blocks for a lot of other concepts such as time/speed, work/rate and mixtures. …

## Interest Equations

The reason people are intimidated by the kinds of compound interest equations we encounter in finance classes is that they …

## Properties of Composite numbers

We love to talk about prime numbers and their various properties for CAT preparation, but composite numbers usually aren’t mentioned. …

## Absolute Values

Let’s look at an absolute value concept involving two variables. It is unlikely that you will see such a question …

## Beware of the “Unique occurences” on DS

How you should approach Data Sufficiency questions? Let us see the problem: What is the value of x? (1) x^2 …

## How to solve “plan” CR questions

Here is how “plan” questions are different from your regular strengthen/weaken questions – instead of a conclusion, we are given situations …