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How many gallons of milk containing 5% butter fat must be mixed with 100 gallons of 1% milk to obtain 2% milk?

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    Let x = number of gallons of %5 milk
    0.05x + 0.01(100) = 0.02(x+100)
    0.05x + 1 = 0.02(x+100)
    0.05x + 1 = 0.02x + 2
    0.03x = 1
    x = 33 and 1/3

    Write back if you need more explanation

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