SOLUTION: How much of an alloy that is 30% copper should be mixed with 400 ounces of an alloy that is 90% copper in order to get an alloy that is 70%?

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Question 1021681: How much of an alloy that is 30% copper should be mixed with 400 ounces of an alloy that is 90% copper in order to get an alloy that is 70%?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
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T=amount of 30% alloy
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0.30T+0.90(400)=0.70(T+400)
0.30T+360=0.70T+280
80=0.40T
200=T
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ANSWER: 200 ounces of 30% alloy should be used.
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