GWD26-31

meckychen · 发表于 2010-1-22 11:13:27

Q31:

One kilogram of a certain coffee blend consists of x kilogram of type I coffee and y kilogram of type II coffee. The cost of the blend is C dollars per kilogram, where C = 6.5x + 8.5y. Is x < 0.8?

(1) y > 0.15

(2) C ≥ 7.30

Answer is B

How to analyze?

Thanks

我心向明月 · 发表于 2010-1-22 12:39:31

x+y=1
C = 6.5x + 8.5y = 6.5(x+y)+2y=6.5+2y
c=6.5+2y

条件1，无法判断。
条件2，y = (c-6.5)/2 > 0.4，x<0.6，可以判定

meckychen · 发表于 2010-1-22 16:16:59

Thank you.

GWD26-31

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