Year: 2015

Problem Solving – Logic Not Formulae

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A lot of test-takers feel that like for other tests for the GMAT Quantitative as well they need to learn a lot of formulae. They often come and tell us they are revising all the formulas in the last few days before the test; nothing could be more superfluous since very few GMAT problems actually test your knowledge of formulas apart from problems involving Geometry. What is evaluated your ability to reason in a quantitative context as this question from the Official Guide (OG) illustrates. If s and t are positive integers such that s/t=64.12, which of the following could be a remainder when s is divided by t? (A) 2 (B) 4 (C) 8 (D) 20 (E) 45 Many test-takers are flummoxed by this problem because they do not know what to do with it! They quickly realize that there is no formula they can apply and that they only have their wits to rely on. So how does one approach it?

Critical Reasoning: Correlation-Causation — Weaken Question 1

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The biggest misconception about Critical Reasoning questions on the GMAT® is that they are based on common sense. Well, nothing could be farther from the truth. In fact, CR questions are based on rules of formal logic. The question from the Official Guide (OG) below is a perfect illustration. A study of marital relationships in which one partner’s sleeping and waking cycles differ from those of the other partner reveals that such couples share fewer activities with each other and have more violent arguments than do couples in a relationship in which both partners follow the same sleeping and waking patterns. Thus, mismatched sleeping and waking cycles can seriously jeopardize a marriage. Which of the following, if true, most seriously weakens the argument above? (A) Married couples in which both spouses follow the same sleeping and waking patterns also occasionally have arguments that can jeopardize the couple’s marriage. (B) The sleeping and waking cycles of individuals tend to vary from season to season. (C) The individuals who have sleeping and waking cycles that differ significantly …