Questions 1 - 27, pg 278 - 279

Free online video lessons from khanacademy
covering the practice questions in the data sufficiency math section of The Official Guide
for GMAT Review.

It would be best that you go through the GMAT practice test questions in the Study Guide first and then look at the videos for the questions that you might need help in.

**Questions
1-5, pg. 278
**

**Questions 6-9, pg. 278 **

**Questions 10-15, pgs. 278-279 **

**Questions 16-21, pg. 279 **

**Questions 22-27, pg. 279 **

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You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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