[問題]GWD27-Q33

[applepeko]

Q33:

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.

答案是A,感覺我腦袋打結了@_@,幫幫我謝謝妮

[kwtluck]

[條件一]
不是回答喜歡M或N的有40人=回答不喜歡或不知道的有40人
則有60人回答喜歡M或N
題目已知喜歡M有40人,喜歡N有30人
(喜歡M且喜歡N)=40+30-60=10

[條件二]
僅能算出不喜歡M與不喜歡N的人數

[applepeko]

哇 謝謝呢!! 原來我把她想的太複雜了...
了解 了
謝謝幫忙歐!!!