GMAT Data Sufficiency Problems
Questions 138 - 150, pg 289 - 290

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 138 - 150 (starting from page 289 in the Study Guide)

Questions 138-140, pg. 289

Questions 141, pg. 289

Questions 142-144, pg. 290

Questions 145-147, pg. 290

Questions 148-150, pg. 290

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