Here’s a set of 10 practice DS questions about Geometry.

# Archive | Data Sufficiency

## 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 […]

## Tricky Data Sufficiency Questions: Explanations #7 and #8

Today, we’re going to review the last two questions from the Tricky Data Sufficiency Questions practice post. If you’re just tuning in, give the questions a shot, check your answers here, and then review the explanations to questions #1-2, #3-4, and #5-6. Ready? Let’s move along. Question #7 7. If p + q = 2r […]

## Tricky Data Sufficiency Questions: Explanations #5 and #6

Today, we present the explanations for questions #5-6 from our Tricky Data Sufficiency Questions challenge. Be sure to check out the explanations for questions #1-2, and questions #3-4 before moving on to today’s post. Let’s get started. Question #5 5. What is the value of m+n? (1) mn = -8 (2) -2m = n […]

## Tricky Data Sufficiency Questions: Explanations #3 and #4

Today, we present the explanations to questions #3-4 from our Tricky Data Sufficiency Questions challenge post. You can find the explanations to questions #1-2 here. Let’s get started. Question #3 3. If 2x = 2y – 3z, what is the value of z? (1) y = x + 2 (2) x = y – […]

## Tricky Data Sufficiency Questions: Explanations #1 and #2

Today, we present the explanations for the first two questions in our Tricky Data Sufficiency Questions post. Let’s get started. Question #1 1. What is the value of x? (1) 5x + 3y = 15 (2) y = 5 – (5/3)x (A) Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. […]

## Tricky Data Sufficiency Questions: Answer Key

On Monday, we presented a series of tricky data sufficiency questions, to test whether or not you’re able to steer clear of all the traps. Today, we present the answers to those questions, so that you can check your work. Over the next week or so, we will publish posts with in-depth explanations of how […]

## GMAT Data Sufficiency: Rephrasing the Question

First, here are 12 practice problems. Solutions will be given at the end of this article. 1) Two teachers, Ms. Ames and Mr. Betancourt, each had N cookies. Ms. Ames was able to give the same number of cookies to each one of her 24 students, with none left over. Mr. Betancourt also able to […]

## Tricky Data Sufficiency Questions

My most recent blog posts have concerned tricky Data Sufficiency questions about systems of equations. Specifically, they’ve been about what can go wrong when you misremember a rule and assume 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 […]

## GMAT Data Sufficiency: More Practice Questions

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. […]