SOLUTION: How much of an alloy that is 30% copper should be mixed with 400 ounces of an alloy that is 70% copper in order to get an alloy that is 50% copper?

Question 846073: How much of an alloy that is 30% copper should be mixed with 400 ounces of an alloy that is 70% copper in order to get an alloy that is 50% copper?
Found 2 solutions by richwmiller, Alan3354:
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
.3x+.7*400=.5*(300+x)
x=650
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
50% is the average of 30% and 70%, so it's an equal amount.
400 ounces.
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