[讨论]涛涛数学第一套的几个题目

跑跑卡丁车

Q10:

A set of numbers has the property that for any number t in the set, t + 2 is in the set.  If –1 is in the set, which of the following must also be in the set?

I.                     -3

II.                   1

III.                  5

A.    I only

B.    II only

C.    I and II only

D.    II and III only

E.    I, II, and III

答案选D。

但是个人觉得选E。

-3难道不是么？t,t+2,t-2似乎都应该在题目中的集合里吧？

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.

Answer:

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答案选D。

（1）不是问题，请教大家（2）是怎么推出来的？

Q35:

What is the median number of employees assigned per project for the projects at Company Z?

(1)   25 percent of the projects at Company Z have 4 or more employees assigned to each project.

(2)   35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.

                  

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.

Answer:

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答案选C。

此题没看懂是什么意思。。。。求教大家~~

[此贴子已经被作者于2008-11-17 17:23:19编辑过]