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Find how many quarts of 4% butterfat milk and 1% butterfat milk should be mixed to yield 90 quarts of 2 % butterfat milk.

  • Math -

    let the amount of 4% milk be x
    then the amount of 1% mild is 90-x

    .04x + .01(90-x) = .02(90)
    multiply by 100
    4x + 1(90-x) = 2(90)
    4x + 90 - x = 180
    3x = 90
    x = 30

    add 30 quarts of 4% with 60 quarts of 1%

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