GMAT Data Sufficiency Problems
Questions 73 - 90, pg 284 - 285
Free online video lessons from khanacademy
covering the practice questions in the problem-solving 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 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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