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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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2 answers
  1. 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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  2. x) 27.5
    y)47.5

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