SOLUTION: Please help me solve this: How much of an alloy that is 10% copper should be mixed with 500 ounces of an alloy that is 80% copper in order to get an alloy that is 20% copper?

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Question 593228: Please help me solve this: How much of an alloy that is 10% copper should be mixed with 500 ounces of an alloy that is 80% copper in order to get an alloy that is 20% copper?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.8*500+.1x=.2*(500+x)