GMAT Data Sufficiency Problems
Questions 73 - 90, pg 284 - 285

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 73 - 90 (starting from page 284 in the Study Guide)

Questions 73-76, pg. 284

Questions 77-79, pg. 284

Questions 80-83, pg. 284

Questions 84-86, pg. 285

Questions 87-90, pg. 285

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