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Anne and Nancy use a metal alloy that is 20.45% copper to make jewelry. How many ounces of a 12% alloy must be mixed with a 25% alloy to form 100 ounces of the desired alloy?

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  1. amount of 12% stuff ---- x
    amount of the other stuff ---- 100-x

    solve for x:

    .12x + .25(100-x) = .2045(100)

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