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[Data Sufficiency]

试题详情

题目:

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.

选项:

答案:

A

提问:

为什么不选D呢?条件(2)的话设两种邮票各买了x个,则有:0.15x+0.29x=4.4,解得x=10啊。

解答:

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解答: 徐小梅老师

提问:

老师 为什么c不成立 还是没有听懂 为什么a单独就可以解出来

解答:

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解答: 徐小梅老师

提问:

C不行么?

解答:

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解答: sysadmin老师

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