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PREP模考题求助
3 grades of milk are 1%, 2% and 3% fat by volume. if x gallons of the 1% grade, y gallons of the 2%, and z gallons of the 3% are mixed to give x+y+x gallons of a 1.5% 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
请求各路大侠的帮助 |
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