# algebra

how much copper and how much iron should be added to 100% pounds of an alloy containing 25% copper and 40% iron in order to obtain an alloy containing 30% copper and 50% iron?

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1. 99

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2. If x lbs of copper and y lbs or iron are added, then we need

25 + x = .30(100+x+y)
40 + y = .50(100+x+y)

Now just solve for x and y. Be sure to check your answers.

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3. x) 27.5
y)47.5

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