GMAT Data Sufficiency Problems
Questions 51 - 72, pg 281 - 283

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 51 - 72 (starting from page 281 in the Study Guide)

Questions 51-54, pgs. 281-282

Questions 55-58, pg. 282

Questions 59-62, pg. 282

Questions 63-68, pgs. 282-283

Questions 68-72, pg. 283

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