algebra

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 320 grams of a copper-silver alloy that is 20% copper by weight? (Round your answers to one decimal place.)

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  1. copper: what is 20 percent of 320
    silver: what is 80 percent of 320

    This is hardly algebra.

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