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29 October, 06:04

At least how many grams of copper must be alloyed with 387 g of pure silver to produce an alloy that is no more than 90% pure silver

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  1. 29 October, 06:32
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    Let c = grams of copper to be added

    (grams of silver) / (grams of copper and silver) < =.90

    387+%2F+%28c+%2B+387%29+%3C=+.9

    387+%3C=+.9%28c+%2B+387%29

    387+%3C=+.9c+%2B+348.3

    .9c+%3E=+387+-+348.3

    .9c+%3E=+38.7

    c+%3E=+43g

    At least 43 grams of copper must be added

    check:

    387+%2F+%28c+%2B+387%29+%3C=+.9

    387+%2F+%2843+%2B+387%29+%3C=+.9

    387+%2F+430+%3C=+.9

    .9+%3C=+.9
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