SOLUTION: How much of an alloy that is 20% copper should be mixed with 600 ounces of an alloy that is 70% copper in order to get an alloy that is 30% copper?

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Question 345999: How much of an alloy that is 20% copper should be mixed with 600 ounces of an alloy that is 70% copper in order to get an alloy that is 30% copper?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 20% copper.
20A%2B70%28600%29=30%28A%2B600%29
20A%2B42000=30A%2B18000
-10A=-24000
A=2400ounces