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Problem 13 (2020 AMC 8)

AMC 8Easy

From module Introduction to Probability

Problem

Jamal has a drawer containing 66 green socks, 1818 purple socks, and 1212 orange socks. After adding more purple socks, Jamal noticed that there is now a 60%60\% chance that a sock randomly selected from the drawer is purple. How many purple socks did Jamal add?

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