SOLUTION: how much alloy that is 40% copper should be mixed with 300 ounces of an alloy that is 70% copper in order to get an alloy that is 50%

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Question 426148: how much alloy that is 40% copper should be mixed with 300 ounces of an alloy that is 70% copper in order to get an alloy that is 50%
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
.4m+300(.7)=.5(m+300)
.4m+210=.5m+150
.1m=60
m=60/.1=600
You need 600 ozs. for your mix..