GMAT Data Sufficiency Problems
Questions 51 - 72, pg 281 - 283
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.
These video lessons 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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