## Data Sufficiency Articles

#### Knewton Brutal Math Challenge – Week 9

by John Davies on May 20, 2010

The shirt is once again in play. Find the answer in the crosshairs, and bring it home. When exactly years have passed since the day [...]

#### “Layering” in Data Sufficiency Questions

by Manhattan Prep on May 9, 2010

This week, we have a follow-on article from Chris Ryan, Manhattan GMAT’s Director of Instructor and Product Development. Chris introduced the concept of “layering” to [...]

#### Manhattan GMAT Challenge Problem of the Week – 6 May 10

by Michael Dinerstein on May 6, 2010

Welcome back to this week’s Challenge Problem! As always, the problem and solution below were written by one of our fantastic instructors. Each [...]

#### Knewton Brutal Math Challenge – Week 7

by John Davies on May 5, 2010

The “Knerd” shirts are kinda blowing up. Students at a conference last week were peaking out to them. Answer this brutal question correctly, show your [...]

#### Going Green on Yes/No Data Sufficiency? Recycle, Then Mine the Overlap!

by Elia Zashin on April 25, 2010

#### Data Sufficiency, Sample Problem: Don’t Do More Work Than You Have To!

by Elia Zashin on April 23, 2010

Savvy GMAT testers don't do more Math than they have to!

#### Knewton Brutal Math Challenge – Week 5

by John Davies on April 21, 2010

We have new shirts! Check them out on our Tumblr page. Be the first person to answer correctly with shown work, and the shirt shall [...]

#### Kaplan GMAT 13: Inequalities

by Kaplan GMAT on April 21, 2010

Video 13 in a series of official excerpts from the Kaplan GMAT program. This video covers the basics of inequalities. The instructor is Devin Landin [...]

#### Manhattan GMAT Challenge Problem of the Week – 16 Apr 10

by Michael Dinerstein on April 16, 2010

A number of eggs dyed various colors were hidden for an egg hunt. How many eggs in total were hidden?

#### Kaplan GMAT 5: Combining Statements in Data Sufficiency

by Kaplan GMAT on April 10, 2010

Here is Video 5 in our series of official excerpts from the Kaplan GMAT program. If both data sufficiency statements are insufficient individually, treat them [...]

#### Kaplan GMAT Video: Calculation vs. Conceptualization

by Kaplan GMAT on April 7, 2010

The primary goal in Data Sufficiency is to conceptualize, NOT to calculate!  We’ll look more closely at the importance of this concept and one approach [...]

#### Kaplan GMAT Video: Number Properties

by Kaplan GMAT on April 5, 2010

This in-depth look at Number Properties in Data Sufficiency questions will provide you with essential strategies, practice, and reminders for this common quantitative question type.

#### Kaplan GMAT Video: The Data Sufficiency Question Type

by Kaplan GMAT on April 4, 2010

We’ll examine the basic structure and format of the Data Sufficiency question type: a question type which is unique to the GMAT exam.

#### Manhattan GMAT Challenge Problem of the Week – 1 Apr 10

by Michael Dinerstein on April 1, 2010

If ab ≠ 0 and a ≠ -3b, what is the value of (4a + 6b)/(a + 3b)?