Posted by Ivan on Tuesday, January 18, 2011 at 12:34am.
An alloy of copper is 10% copper and weighs 25 pounds. A second alloy is 18% copper. How much (to the nearest tenth lb.) of the second alloy must be added to the first alloy to get a 13% mixture.

Geometry  Anonymous, Thursday, September 1, 2016 at 4:30pm
15
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