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Two metal alloys, containing 26% copper and 54% copper are to be mixed together to get 210 oz that is 30% copper. How much of each should be used?

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    Ratio required:
    (54-30)/(30-26)
    =24/4
    =6/1

    Weight of 26% alloy:210*(6/7)=180 oz
    Weight of 54% alloy:210*(1/7)=30 oz

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