[求助]天山 3-20

uniqueness

Q20: 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.

ANS A

MINE C

不会啊

请NN帮忙

shhuang

不是吧

两个都没投 的+同时投两个的=TOTAL?

那只投一个的呢?

fastrunner

The number of voters who did not respond “favorable” for either candidate plus the number of voters who responded “favorable” for both are equal to total voters…

So A is right…

To be discussed…

sammen

这里A，我认为是对的。40其实就是＝100－至少favor一个的人数。那么favorM并favorN的人数就是60个，而favorM和favorN的人数之和是70，可以得到both的是10个人。