How much low fat milk(1%) and whole milk(4%) should be mixed to make 5 gallons of reduced fat milk (2%)?

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  1. a =1%
    5 -a = 4%

    0.01a+ 0.04(5-a) = 5(0.02)

    .0.01a+ 0.2 -0.04a = 0.1

    -0.03a + .2 = 0.1

    -0.03a + .2 -.2 = 0.1-0.2

    -.03a = -.1

    a = 10/3
    4% = 5-a
    10/3 mixed with low fat milk (1%)
    5/3 mixed with whole milk(4%)

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