SOLUTION: How much of an alloy that is 30% copper should be mixed with 200 ounces of an alloy that is 90% copper in order to get an alloy that is 70% copper?

SOLUTION: How much of an alloy that is 30% copper should be mixed with 200 ounces of an alloy that is 90% copper in order to get an alloy that is 70% copper?

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Question 98326: How much of an alloy that is 30% copper should be mixed with 200 ounces of an alloy that is 90% copper in order to get an alloy that is 70% copper?
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
x(30%)+(200)(90%)=(200+x)(70%) ... .3x+180=140+.7x ... 40=.4x ... 100=x
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