A lot of GMAT test-takers vaguely remember a rule from high school, that it’s possible to solve for two variables if and only if you’re given two equations, and generally that it’s possible to solve for n variables if and only if you’re given n equations. Unfortunately, that rule isn’t quite correct as written, and […]

## GMAT Tricks with Systems of Equations: Part 4

A lot of GMAT test-takers vaguely remember a rule from high school, that it’s possible to solve for two variables if and only if you’re given two equations, and generally that it’s possible to solve for n variables if and only if you’re given n equations. Unfortunately, that rule isn’t quite correct as written, and […]

## GMAT Tricks with Systems of Equations: Part 3

A lot of GMAT test-takers vaguely remember a rule from high school, that it’s possible to solve for two variables if and only if you’re given two equations, and generally that it’s possible to solve for n variables if and only if you’re given n equations. Unfortunately, that rule isn’t quite correct as written, and […]

## GMAT Tricks with Systems of Equations: Part 2

A lot of GMAT test-takers vaguely remember a rule from high school, that it’s possible to solve for two variables if and only if you’re given two equations, and generally that it’s possible to solve for n variables if and only if you’re given n equations. Applying this rule incorrectly causes quite a few errors […]

## GMAT Tricks with Systems of Equations: Part 1

## Difficult Numerical Reasoning Questions

The GMAT Quantitative section excels at creating problems that frustrate folks who try to get through math by memorizing formulas. It excels at creating out-of-the-box problems that really demand folks use logic and number sense to dissect the problem. Here are four out-of-the-box Data Sufficiency problems to consider. 1) Peter went to the store to […]

## GMAT Tuesdays with Kevin: Data Sufficiency Practice

Hello! This week, I’ll be explaining how you can avoid a very tricky data sufficiency trap that’s often on the GMAT! I’ll be referring to the data sufficiency answer choices in this problem, so if you need a refresher on what those are, you can find them here. As always, leave us any questions or […]

## GMAT Quant: Arithmetic with Inequalities

Here are four GMAT Data Sufficiency questions involving inequalities. Full solutions will come at the end of this article. The arithmetic of equations: a review First of all, let’s review what should be more familiar — the arithmetic of equations. Suppose A = B and P = Q. The soundbyte is: you can combine […]

## GMAT Tuesdays with Kevin: Data Sufficiency Workflow Flowchart

Hi, everyone! This week’s video is one of my favorites, because it’s about Data Sufficiency, and it has an awesome flowchart: Here’s a screenshot of the flowchart (you should memorize it!):

## GMAT Data Sufficiency Practice Questions on Probability

First off, some of my previous blogs that may be relevant: 1) Data Sufficiency Tips 2) Probability Rules 3) The probability of the “at least” scenario 4) Probability problems involving counting Here are eight practice questions. Solutions will appear at the end of the article. 1) In nine independent trials, what is the probability that […]

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