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A dairy farmer wants to mix a 20% protein supplement and a standard 10% protein ration to make 1200 pounds of a high-grade 15% protein ration. How many pounds of each should he use?

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  1. If there are x lbs of the 20% protein, then the rest (1200-x) is 10%.

    So, adding up the amounts of protein, it must equal the total:

    .20x + .10(1200-x) = .15(1200)

    Since 15% is halfway between 10% and 20%, expect the mix to be half and half.

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