## Data Sufficiency Articles

#### Knewton Brutal Math Challenge – Week 9

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

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

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

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!

Recycling your work on Yes/No Data Sufficiency questions will help you maximize your efficiency on the GMAT Math section.

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

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

#### Knewton Brutal Math Challenge – Week 5

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

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

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

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

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

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

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

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