SOLUTION: how much of an alloy that is 10% copper should be mixed with 300 ounces of alloy that is 60% copper in order to get an alloy that is 40% copper?

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Question 326916: how much of an alloy that is 10% copper should be mixed with 300 ounces of alloy that is 60% copper in order to get an alloy that is 40% copper?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let X be the amount of 10% copper.
10X%2B60%28300%29=40%28X%2B300%29
10X%2B18000=40X%2B12000
30X=6000
highlight%28X=200%29
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Add 200 ounces of 10% copper.