Homework Help: 8th grade

Posted by Jake on Thursday, December 9, 2010 at 8:39pm.

An alloy of metals is 25% copper .Another alloy is 50% copper. How much of each alloy should be used to make 1000grams of an alloy that is 45% copper?

8th grade - TutorCat, Thursday, December 9, 2010 at 11:11pm
.25(x)+.50(1000-x)=.45(1000)

where x is the number of grams of 25% copper

and 1000-x is the rest of the 1000 grams i.e. the number of grams of 50%

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