1-6, pg. 152. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/test-prep/gmat/problem-solving/v/gmat-math-2?utm_source=YT&utm_medium=Desc&utm_campaign=GMAT

GMAT on Khan Academy: Sal works through the 249 problem solving questions in chapter 5 of the the 11th edition of the official GMAC GMAT Review (ISBN Number: 0-9765709-0-4 published in 2005)

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