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2010 AMC 8 Problems/Problem 12

Revision as of 14:31, 30 October 2012 by Bigc08 (talk | contribs) (Created page with "Since 80 percent of the 500 balls are red, there are 400 red balls. Therefore, there must be 100 blue balls. For the 100 blue balls to be 25% or 1/4 of the bag, there must be 400...")
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Since 80 percent of the 500 balls are red, there are 400 red balls. Therefore, there must be 100 blue balls. For the 100 blue balls to be 25% or 1/4 of the bag, there must be 400 balls in the bag so 100 red balls must be removed. The answer is D.

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