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Archive | Quantitative

GMAT Tuesdays: Data Sufficiency – Watch Your Assumptions!

    Don’t get caught assuming too much on the GMAT. They are looking for students to make big assumptions when they are trying to save time. In this Data Sufficiency question, there is a big trap for anyone who assumes too much about the problem. For more practice with traps on Data Sufficiency questions, click […]

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Manipulating Algebraic Equations and Expressions with Fractions: Systems of Equations

A student writes, Sometimes the answer explanation suggests that I clear fractions by multiplying an entire equation by a common denominator. Sometimes the answer explanation suggests that I manipulate just one side of an equation. How do I know which is better? This is a surprisingly subtle question. It turns out that the answer is […]

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