求指教一题数学 帮帮忙~

LadyDenise

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.

这题我觉得我是对的啊！！！答案选D 不知道为什么，两个一加然后拿总的一除不就是了？？聪明点选A 应该但是（2）哪里对了？

treewing929

0.15a+0.29a =4.4

LadyDenise

但是答案选D 我就不懂了

treewing929

0.15a+0.29a =4.4

-- by 会员 treewing929 (2012/3/9 17:41:05)

打錯了

LadyDenise

后来我觉得A也可以 除了10 没有其他能4.4了

treewing929

后来我觉得A也可以 除了10 没有其他能4.4了

-- by 会员 LadyDenise (2012/3/9 17:44:29)

對! 是 A
答案 D...我也不知道了!

treewing929

同求

LadyDenise

谢谢你~~

treewing929

谢谢你~~

-- by 会员 LadyDenise (2012/3/9 17:47:31)

謝謝你提出問題!!
一起討論, 一起進步!!

深圳的游子

这还不简单的，答案错了么