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 20% copper?

Question 269725: 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 20% copper?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
In words:
(ounces of copper in final mixture)/(ounces of final mixture)= 20%
Let = ounces of 10% copper alloy needed

2500 ounces of 10% copper alloy are needed
check:

OK
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