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Algebra

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How much 20% and 40% copper alloy should be mixed to yield 500 kilograms of 25% copper alloy

  • Algebra -

    box 1
    x kg
    .2x copper
    .8 x whatever

    box 2
    y kg
    .4 y copper
    .6 y whatever

    box 3
    x+y kg = 500
    .25*500 = 125 kg copper
    375 kg whatever

    so
    125 = .2 x + .4 y
    500 = x + y

    take it from there

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