标题: 睡前问数学题--OG13 Data Sufficiency 134 [打印本页] 作者: helenchen0413 时间: 2014-3-31 00:21 标题: 睡前问数学题--OG13 Data Sufficiency 134
Favorable
Unfavorable
Not Sure
Canidate M
40
20
40
Candidate N
30
35
35
The table above shows the results of a survey of 100 voters who each responed 'favorable' or 'unfavorable' or 'not sure' when asked about their impressions of candidate M and N. What was the number of voters who responded 'favorable' for both candidates?
1) The number of voters who didn't respond 'favorable' for either candidate was 40
2) The number of voters who responed 'unfavorable' for both candidates was 10
看不懂OG解释,脑子晕了，求大牛解释 作者: mutou000 时间: 2014-3-31 01:04
40+30=70， 这70人是vote favorable at least once (其中包括both的). 当40人didn't vote favorable for either candidate. (这句话可以理解为, unfavorable + not sure + 也没有vote both) 100 - 40 = 60 就是 did vote favorable for one candidate only. 60 compare with 70差别就是both 的人数. 70里面包括了"both", 而60里面没包括) 70-60 = 10. 就是vote favorable for both 的人数.