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作者: queenie924 时间: 2011-2-27 09:03
You got a typo in the question. x+y+z gallons
1x + 2y +3z = 1.5x +1.5y +1.5z
0.5y + 1.5z = 0.5x
x = y + 3z作者: Vickyliu 时间: 2011-2-27 20:07
谢谢你帮我理清了这道题的思路。
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