SOLUTION: How much of an alloy that is 10% copper should be mixed with 500 ounces of an alloy that is 70% copper in order to get an alloy that is 30% copper?

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Question 460772: How much of an alloy that is 10% copper should be mixed with 500 ounces of an alloy that is 70% copper in order to get an alloy that is 30% copper?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
500x.7=350
.1x+350=.3(x+500)
.1x+350=.3x+150
.2x=200
x=200/.2=1000
You need 1000 ozs. of 10% copper for the mix..