求助 DS

green1

1 the table shows the results of a survey of 100 voters who each respondered "favorable" ,"unfavorable", "not sure" when asked about their impressions of candidates M and candidate N. what was the number of voters who responded "favourable" for both candidates?

	favourable	unfavourable	not sure
M	40	20	40
N	30	35	35

（1）the number of voters who did not responded favorable for either candidate was 40
(2) the number of voters who responded unfavourable for both candidate was 10

不明白答案 A    我认为（1）只能说明余下的100-40 是unfavorable or not sure 呀！！

machao924

OG Edition 12, DS 124题