一道data题！不明白！

Xiaotongdi · 发表于 2011-4-17 16:33:16

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.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

这题答案是A！我实在不解！我有试过用别人说过的代入计算，但是也算不出来啊！这题到底怎么入手？

huxleyxu · 发表于 2011-4-17 16:52:07

第一种stamp是0.15单价，那么购买第一种stamps的总价的cent那位是始终是5或0
第二种是0.29，而且总价的cent那位是0，如果要达到这个要求第二种stamp的数量只可能是5,10,15等等
带入算，只有第二种的数量是10的时候符合，解唯一

formyf · 发表于 2011-8-2 15:43:56

它有隐含条件啊，stamp数必须是整数啊

一道data题！不明白！

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