GMAT Data Sufficiency Problems
Questions 121 - 137, pg 288 - 289

This series of videos by khanacademy will show you how to answer the practice questions in the data sufficiency math section of the 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.

The videos on this lesson are for GMAT Practice Questions 121 - 137 (starting from page 288 in the Study Guide)

Questions 121-124, pg. 288

Questions 125-128, pg. 288

Questions 129-131, pg. 289

Questions 132-134, pg. 289

Questions 135-137, pg. 289

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