PREP模考题求助

evelyn205205 · 发表于 2011-2-8 20:38:51

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

sdcar2010 · 发表于 2011-2-8 21:56:37

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

evelyn205205 · 发表于 2011-2-8 21:58:49

谢谢你帮我理清了这道题的思路。

chasingM7 · 发表于 2011-2-8 23:26:15

dude, ur A is Y+Z..zzz typo

kazemi · 发表于 2011-2-8 23:33:36

几天没见楼主了，十分想念，加油哈~

evelyn205205 · 发表于 2011-2-9 15:45:05

谢谢，修改过来了

evelyn205205 · 发表于 2011-2-9 15:46:18

几天没见楼主了，十分想念，加油哈~

-- by 会员 kazemi (2011/2/8 23:33:36)

呵呵，我基本每天都上啊。。。

PREP模考题求助

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