Milk containing (20 %) butterfat is mixed with cream containing (60 %) butterfat to produce half-and-half, which
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Milk containing \(20 \%\) butterfat is mixed with cream containing \(60 \%\) butterfat to produce half-and-half, which is \(50 \%\) butterfat. How many gallons of each must be mixed to make 180 gallons of half-and-half?
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