GMAT Data Sufficiency Problems
Questions 151 - 155, pg 290
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.
The videos on these lessons are for GMAT Practice Questions 151 - 155 (starting from page 290 in the Study Guide)
Questions 151-153, pg. 290
Questions 154-155, pg.290
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