SOLUTION: an alloy of metals is 25% copper. another alloy is 50% copper. how much of each should be used to make 1000 grams of an alloy that is 45% copper?

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Question 347387: an alloy of metals is 25% copper. another alloy is 50% copper. how much of each should be used to make 1000 grams of an alloy that is 45% copper?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
given:
.25a+%2B+.5b+=+.45%2A1000
25a+%2B+50b+=+45000%0D%0A%7B%7B%7Ba+%2B+b+=+1000
25a+%2B+25b+=+25000
By subtraction:
25b+=+20000
b+=+800
a+=+1000+-+800
a+=+200
200 grams of the 25% copper and 800 grams
of the 50% copper should be used