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Math Help - Preparing an alloy

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    Preparing an alloy

    British sterling silver is a copper-silver alloy that is 7.5% copper by weight. How many grams of pure copper and many grams of British sterling silver should be used to prepare 200 grams of a copper-silver alloy that is 10% copper by weight?
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    Quote Originally Posted by amyl View Post
    British sterling silver is a copper-silver alloy that is 7.5% copper by weight. How many grams of pure copper and many grams of British sterling silver should be used to prepare 200 grams of a copper-silver alloy that is 10% copper by weight?
    Let x be the amount of pure copper.

    Solve x + (200-x) \times \frac{7.5}{100} = 200 \times \frac{10}{100}
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