GWD 第27套的几道题目

zhongyaya · 发表于 2010-9-6 23:16:06

Q25:答案选C
What is the sum of a certain pair of consecutive odd integers?
(1)At least one of the integers is negative.
(2)At least one of the integers is positive.

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.

Q30:（题目没读懂）答案选E
If y is the smallest positive integer such that 3,150 multiplied by y is the square of an integer, then y must be

A.2
B.5
C.6
D.7
E.14

Q33（答案选A）

	Favorable	Unfavorable	Not Sure
Candidate M	40	20	40
Candidate N	30	35	35

The table above shows the results of a survey of 100 voters each responded “favorable” or “unfavorable” or “not sure” when asked about their impressions of candidate M and of candidate N.What was the number of voters who responded “favorable” for both candidates?
(1)The number of voters who did not respond “favorable” for either candidate was 40.
(2)The number of voters who responded “unfavorable” for both candidates was 10.

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.

Q34: （答案选A，显然是错的啊~笨方法算出来是E~求简单的方法）
If n is a positive integer, what is the remainder when 3⁸ⁿ⁺³ + 2 is divided by 5?

A.0
B.1
C.2
D.3
E.4

求高人指教啊~感激不尽

doreendu0809 · 发表于 2010-9-7 00:55:51

Q25:答案选C
What is the sum of a certain pair of consecutive odd integers?
(1)At least one of the integers is negative.
(2)At least one of the integers is positive.

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.

一对连续的奇整数，1说有一个为负，2说有一个为正~加起来就是一正一副~那只可能是-1和1，和也就是0~所以C

doreendu0809 · 发表于 2010-9-7 00:57:44

Q30:（题目没读懂）答案选E
If y is the smallest positive integer such that 3,150 multiplied by y is the square of an integer, then y must be

A.2
B.5
C.6
D.7
E.14

3150*y是一个数的平方~分解一下3150=9*25*2*7 9和25都已经是平方~y就是2*7=14

doreendu0809 · 发表于 2010-9-7 01:00:08

Q34: （答案选A，显然是错的啊~笨方法算出来是E~求简单的方法）
If n is a positive integer, what is the remainder when 38n+3 + 2 is divided by 5?

A.0
B.1
C.2
D.3
E.4

这个GWD里有很多题考到3的幂~因为3的n次幂的个位数是以4为循环，分别是3、9、7、1，所以这里面8n可以忽略，3的3次个位数是7，加上2就是9~余数也就是4~答案E

doreendu0809 · 发表于 2010-9-7 01:04:58

Q33（答案选A）

The table above shows the results of a survey of 100 voters each responded “favorable” or “unfavorable” or “not sure” when asked about their impressions of candidate M and of candidate N.What was the number of voters who responded “favorable” for both candidates?
(1)The number of voters who did not respond “favorable” for either candidate was 40.
(2)The number of voters who responded “unfavorable” for both candidates was 10.

这道把Unfavorable和Not Sure 那些数字忽略就可以了~只要注意favorable的30和40~然后根据1有40个人没有favorable~那么就是有60是个至少给一个人favorable的~那么both的就是30+40-60=10
2那个条件只能算出有谁是both unfavorable的但是无法区分开favorable 和not sure 所以没用~

zhongyaya · 发表于 2010-9-7 23:38:42

好强大~感谢啊~前两题是题目没看懂，居然把3，150看成了3和150~囧~
再次感谢

GWD 第27套的几道题目

所属分类: GMAT考试

正在浏览此版块的会员 ()

浏览过的版块