雷哥网GMAT-【OG20-P290-418题】Is the number of members of Club X greater than th_OG16

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【OG20-P290-418题】

Is the number of members of Club X greater than the number of members of Club Y ?

(1) Of the members of Club X, 20 percent are also members of Club Y.

(2) Of the members of Club Y, 30 percent are also members of Club X.

A

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
分析A选项
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B

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
分析B选项
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C

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
分析C选项
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D

EACH statement ALONE is sufficient.
分析D选项
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E

Statements (1) and (2) TOGETHER are NOT sufficient.
分析E选项
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当前版本由 bella 更新于2015-06-26 16:36:44 感谢由 bella 对此题目的解答所做出的贡献。

Question stem is straightforward. Let total number of members of Club X be X, and similarly Y for Club Y. 
Those who are members of both X and Y = XY (Just XY, not X*Y!) 

Statement 1: 
XY = 20% of X 
Say X = 100 
XY = 20 
Nothing to be said of the members in Y. Insufficient. 

Statement 2: 
XY = 30% of Y 
Say Y = 100 
XY = 30 
Nothing to be said of the members in X. Insufficient. 

Both statements together: 

XY = 20% of X = 30% of Y 
This essentially means X > Y 
Sufficient. 

Pick C

题目讨论（4条评论）

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贾思敏

好绝。错题反思：题干：问X俱乐部的人数比Y俱乐部的人数要多吗？设X俱乐部的人数为X，Y俱乐部的人数为Y，有同时参与这两个俱乐部的人数为XY（不是X乘以Y！是两者的交集）条件一：XY=20%*X 若X=100，则XY=20，但Y具体数值仍未知，无法比较，不充分。条件二：XY=30%*Y 若Y=100，XY=30，但Y具体数值仍未知，无法比较，不充分。结合条件一和条件二：XY=20%*X=30%*Y（总数不变，X和Y都是大于零的整数，两者之间各自所乘的数越大，证明这个数本身就越小）所以X大于Y，充分

0 0 回复 2021-09-28 23:27:25
你这只猪

文氏图，取交集

1 0 回复 2020-06-09 17:59:14
235778onxk回复你这只猪

这个妙啊

0 0 回复 2021-06-14 12:29:52
194020wxnp

总数×比例相等比例越大总数越小

0 0 回复 2020-06-06 21:16:41
nailuo1

本题是用比例比较大小，交集相等，（1）（2）式子连立

0 0 回复 2018-08-27 17:09:57