Suppose that you have a supply of a 20% solution of alcohol and a 80% solution of alcohol. How many quarts of each should be mixed to produce 60 quarts that is 65% alcohol?

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  1. amount of 20% stuff ---- x qrts
    amount of 80% stuff = 60-x qrts

    solve for x

    .2x + .8(60-x) = .65(60)

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