Homework Help: math

Posted by k.boy on Wednesday, October 27, 2010 at 7:19pm.

an alloy of metals is 20% copper. another alloy is 50% copper.how much of each should be used to make 1000 gram of an alloy that is 45% copper?

math - bobpursley, Wednesday, October 27, 2010 at 7:24pm
total mass: A+B=1000
copper mass: 1000*.45=.2A+.5B

solve for A, B

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