SOLUTION: How much of an alloy that is 40% copper should be mixed with 100 ounces of an alloy that is 60% copper in order to get an alloy that is 50% copper?

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Question 446499: How much of an alloy that is 40% copper should be mixed with 100 ounces of an alloy that is 60% copper in order to get an alloy that is 50% copper?
Answer by ewatrrr(10682) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Let x represent how much of an alloy that is 40% copper that is needed:

 .40x + .60*100 = .50(100+x)

     .10*100 = .10x

      .10*100/.10 = x

           100 = x



CHECKING our Answer***

 .40*100 + .60*100 = 40 + 60 = 100 = .50*200