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% grade, and z gallons of the 3% 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
Answer : A
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