Weegy: 3.3
let
x = lbs of 15% alloy
30 - x = lbs of 9% alloy
so
0.15x + 0.09(30 - x) = 0.11(30)=3.3 User: 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. Weegy: ok, so the total weight of the first alloy is 25 pounds and since it is 10% copper, that means that 2.5 pounds is copper.
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