On the SAT exam, you have about 2 minutes to read and solve each math question. This one about averages can send you in a loop, unless you approach it systematically. In the video I also explain a shortcut to help you solve this type of problem quickly.

Source: SAT exam question posted on Quora
https://www.quora.com/What-are....-some-of-the-most-di

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Adults Baffled By The Lighthouse Puzzle
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