taotao-1-30，感觉答案有问题

Q30:

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.

答案是D，我给的是A。。。

应该是a

2什么都没有啊

答案是10，10 吧？

这题以前就有过争论。不过题号与此不同。

赞成选A.

应该是D

可设方程式:0.15X+0.29X=4.40, 结果得 10

赞成A
2需要同1联系起来才能出答案，单独不成立。
不过想问一下，1的数是代进去一个一个试出来的吗？

怎么会? 不用第一个条件,就可以算出来呀!!! 那个方程式没有用到第一个条件啊!!!

对啊,B有说equal number