SOLUTION: how much of an alloy that is 20% copper should be mixed with 400 ounces of an alloy that is 60% copper in order to get an alloy that is 30% copper?

Question 782666: how much of an alloy that is 20% copper should be mixed with 400 ounces of an alloy that is 60% copper in order to get an alloy that is 30% copper?
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
how much of an alloy that is 20% copper should be mixed with 400 ounces of an alloy that is 60% copper in order to get an alloy that is 30% copper?
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let x= amount of 20% copper alloy to be mixed with 400 ounces of 60% copper alloy
400-x= amount 60% copper alloy to be mixed with 20% copper alloy
..
20%x+60%(400-x)=30%*400
.20x+240-.60x=120
.40x=120
x=300
amount of 20% copper alloy to be mixed with 400 ounces of 60% copper alloy=300 ounces
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