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20 August, 10:45

Milk that is 4% butterfat is mixed with milk that is 1% butterfat to obtain 18 gallons of milk that is 2% butterfat. how many gallons of each type of milk are needed?

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  1. 20 August, 11:54
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    0.04x+0.01y=0.02 (18)

    x+y=18

    solve the system

    0.04 (18-y) + 0.01y=0.36

    -0.03y=-0.36

    y=12

    x=18-y

    x=6

    6 gallons for 4%

    12 gallons for 1%
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