SOLUTION: An alloy of metals is 25% copper. Another alloy is 50% copper. How much of each alloy should be used to make 1000 grams of an alloy that is 45% copper?
Question 940860: An alloy of metals is 25% copper. Another alloy is 50% copper. How much of each alloy should be used to make 1000 grams of an alloy that is 45% copper? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Let = grams of 25% alloy needed
Let = grams of 50% alloy needed = grams of copper in 25% alloy = grams of copper in 50% alloy
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(1)
(2)
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(2)
(2)
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)
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and, since
(1)
(1)
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200 grams of 25% alloy are needed
800 grams of 50% alloy are needed
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check:
(2)
(2)
(2)
(2)
OK
