SOLUTION: How much of an alloy that is 20% copper should be mixed with 200 ounces of an alloy that is 50% copper in order to get an alloy that is 30% copper?

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Question 345410: How much of an alloy that is 20% copper should be mixed with 200 ounces of an alloy that is 50% 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% alloy.
20A%2B50%28200%29=30%28A%2B200%29
20A%2B1000=30A%2B600
10A=400
A=40
40 ounces of 20% copper are needed.