GWD数学题，求教该题怎么画韦恩图或别的方法

shixiaoliu1986 · 发表于 2010-7-7 10:48:08

	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.
答案是A，有人能帮忙解决一下么，有点晕，不知道怎么弄～大家帮帮忙，觉得好难啊

lynn1357 · 发表于 2010-7-7 11:33:12

（1）m和n都没投的有40人，说明投m、n和m+n的有60人，根据表，设投m+n的有x人，则40-x+（30-x）+x=60，解x=10，因此，投M+N的有10人。
（2）无法求出
选A

GWD数学题，求教该题怎么画韦恩图或别的方法

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