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
B, (y+z) / 4
C, 2y+3z
D, 3y+z
E, 3y+4.5z
+3
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