Questions 151 - 155, pg 290

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
151-153, pg. 290 **

**Questions 154-155, pg.290 **

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