求助GWD几道题目

白菜白菜 · 发表于 2012-8-4 13:05:41

If x and y are integers and x > 0, is y > 0?

(1)    7x – 2y > 0
(2)    -y < x

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E 但我觉得B是对的呀=。=

Q16:

If n is a positive integer and r is the remainder when (n-1)(n+1) is divided by 24, what is the value of r?
(1)    2 is not a factor of n.
(2)    3 is not a factor of n.

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C 完全不懂怎么算
Each week a certain salesman is made a fixed amount equal to $300 plus a commission equal to 5 percent of the amount of these sales that week over $1,000. What is the total amount the salesman was paid last week?

(1)   The total amount the salesman was paid last week is equal to 10 percent of the amount of these sales last week.
(2)    The salesman’s sales last week total $5,000.

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 不大懂(1）怎么对了。。

白菜白菜 · 发表于 2012-8-4 13:07:25

If S is a set of ten consecutive integers, is the integer 5 in S?
  (1)    The integer –3 is in S.
(2)    The integer 4 is in S.

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E 为什么不是C啊！

shinesalvation · 发表于 2012-8-4 13:18:59

If S is a set of ten consecutive integers, is the integer 5 in S?
(1) The integer –3 is in S.
(2) The integer 4 is in S.

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E 为什么不是C啊！

-5——4情况下。

梁泱泱 · 发表于 2012-8-4 14:06:33

第一题x>-y不能推出y>0，举例说明x=3>0,y=-1<0,x>-y，但是y可以小于0~
第二题Q16,24=2^3*3，所以只要(n-1)(n+1)拥有2和3的因子它除以24余数肯定就为0，这就和两个条件联系上了了。条件（1），设不含有因子2的数n=2p+1，则(n-1)(n+1)=2p(2p+2)只能判断一定含有2（及4）这个因子不能判断一定被3整除，故不充分；条件（2），设不含有因子3的数n=3p+1及3p+2，则(n-1)(n+1)=3p（3p+2）及（3p+1）（3p+3），这都只能判定一定含有3这个因子，不能判定含有2，故不充分；综合两个条件，则n可表示为6p+1及6p+5，则(n-1)(n+1)=6p(6p+2)及(6p+4)(6p+6),这两个式子均含有4和3，故充分。证明中可能还有些许漏洞，但是像36,60这样的(n-1)(n+1)的结果是不会出现的，因为他们不能由两个连续偶数相乘而得到。
第三题第一个条件是300+5%（sales-1000）=10%sales一个等式解决问题，充分。
最后一个即时两个条件都有，但集合可能是{-5，-4，-3，-2，-1,0,1,2,3,4}不一定有5啊。

白菜白菜 · 发表于 2012-8-5 14:28:34

嗯嗯！

白菜白菜 · 发表于 2012-8-5 14:30:01

嗯嗯谢谢啦 @很详细

求助GWD几道题目

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