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3 grades of milk are 1%, 2% and 3% fat by volume. If x [#permalink]
05 Nov 2006, 13:11
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3 grades of milk are 1%, 2% and 3% fat by volume. If x gallons of 1% grade, y gallons of 2% grade, and z gallons of 3% grade are mixed to give x+y+z gallons of 1.5% grade, what is x in terms of y and z?