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标题: GWD19-35 [打印本页]

作者: xiongxiong88 时间: 2006-6-3 14:52 标题: GWD19-35

Q35:

The weights of all dishes of type X are exactly the same, and the weights of all dishes of type Y are exactly the same. Is the weight of 1 dish of type X less than the weight of 1 dish of type Y ?

(1) The total weight of 3 dishes of type X and 2 dishes of type Y is less than the total weight of 2 dishes of type X and 4 dishes of type Y.

(2) The total weight of 4 dishes of type X and 3 dishes of type Y is less than the total weight of 3 dishes of type X and 4 dishes of type Y.

这题为什么选b呢？用列举法？有啥道理可言呀？

作者: kuuiytt 时间: 2006-6-3 16:12

From condition 1: 3x+2y < 2x+4y => x < 2y (inconclusive)
From condition 2: 4x+3y < 3x+4y => x < y

作者: missouyang 时间: 2006-6-4 19:47

ding !!!!!

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