Math

British sterling silver is a copper-silver alloy that is 7.5% copper by weight. How many grams of pure copper and how many grams of British sterling silver should be used to prepare 200 grams of a copper-silver alloy that is 10% copper by weight? (round to the nearest tenth)

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  1. amount of silver --- x g
    amount of copper --- 200-x g

    .075x + 200-x = .1(200)
    -.925x = -180
    x = appr 194.6 g

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