237-239, pg. 185.
Sal has done all problem solving problems in "The Official Guide for GMAT Review" by the Graduate Management Admission Council (which he recommends you buy) in the videos below.
Khan Academy is dedicated to the goal of providing a free world-class education for everyone. Founded by Salman Amin Khan, the website features over 3,200 short-form videos that provide a basic introduction to a variety of topics that span from mathematics to current world events. The site is visited by over four million learners each month, and is widely considered an invaluable learning tool for individuals looking for a quick refresher on a subject. The videos are produced in a conversational style and specially designed to be easily viewed on a computer screen.
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