SOLUTION: How much of an alloy that is 20% copper should be mixed with 400 ounces of an alloy that is 80% copper in order to get an alloy that is 40% copper?

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Question 1053237: How much of an alloy that is 20% copper should be mixed with 400 ounces of an alloy that is 80% copper in order to get an alloy that is 40% copper?
Answer by ewatrrr(24785) About Me  (Show Source):
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.20x + .80(400oz) = .40(400oz+x)
.20x + .80(400oz) = .40(400oz) + .40x
.40(400oz)/.20 = x