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 476083: 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 ankor@dixie-net.com(22740) About Me  (Show Source):
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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
:
Let x = amt of 20% copper required to accomplish this
:
.20x + .70(600) = .30(x+600)
:
.20x + 420 = .30x + 180
.20x - .30x = 180 - 420
-.10x = -240
x = %28-240%29%2F%28-.10%29
x = 2400 oz of 20% copper required