In the following problems, remember: no calculator! Difficulty levels range from medium to hard. 2) Maggie is 15 years older than Bobby. How old is Bobby? Statement #1: In 3 years, Maggie’s age will be 50% larger than Bobby’s age. Statement #2: Years ago, when Maggie was 25 years old, Bobby was 10 years old. […]

## GMAT Tricks with Systems of Equations: Part 5

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!):

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