Pre Calc

How many pounds of dog food worth $.80 per pound must be mixed with dog food worth $.65 per pound to make a mixture of 60 pounds worth $.70 per pound?

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  1. let the amount of the more expensive mix be x pounds
    then the amount of the cheaper mix has to be 60-x pounds

    .80x + .65(60-x) = .70(60)
    times 100 , (I don't like decimals)
    80x + 65(60-x) = 70(60)
    80x + 3900 - 65x = 4200
    15x = 300
    x = 20

    Use 20 pounds of the expensive kind and
    40 pounds of the cheaper

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    posted by Reiny

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