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标题: [讨论]GWD10数学第30题 [打印本页]

作者: sunjueliang 时间: 2005-12-3 18:51 标题: [讨论]GWD10数学第30题

Joanna bought only $0.15 stamps and $0.29 stamps. How many $0.15 stamps did she
buy?
(1) She bought $4.40 worth of stamps.
(2) She bought an equal number of $0.15 stamps and $0.29 stamps.

GWD Ans: D

疑问1：只有（2）推不出来

疑问2：好像只需要（1）就可以得到。

0.15x+0.29y=4.40

其中x,y为正整数，可以得出x=y=10.

那位大虾讨论一下？

作者: braveMBA 时间: 2005-12-4 07:38

同意，只有（1）能推出来

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