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Three grades of milk are 1 percent, 2 percent, and 3 percent [#permalink]
22 Sep 2005, 20:13
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Three grades of milk are 1 percent, 2 percent, and 3 percent fat by volume. If x gallons of the 1 percent grade, y gallons of the 2 percent grade, and z gallons of the 3 percent grade are mixed to give x+y+z gallons of a 1.5 percent grade, what is x in terms of y and z?
A. y + 3z
C. 2y + 3z
D. 3y + z
E. 3y + 4.5z
(Edited for typo: It's z gallons of 3% milk, not 3 gallons of 3% milk. Sorry about that.)