菜鸟求问两道弱弱数学题

kriszUID: 160672

1。If a,b,and c are three consecutive odd integers such as 10<a<b<c and if b and c are prime numbers, what is the value of a+b?
24    28    30    32    36
答案里讲要选32， 可我觉得应该是24啊

2。Of a group of pple surveyed in a political poll, 60% said that they would vote for candidate R. Of those who said they would vote for R. 90% actually voted for R. and of those who did not say that they would vote for R. 5% actually voted for R. What % of the group voted for R?
56%    59%     62%      65%       74%
正确答案是56， 可是为什么不是59呢？？

恳请大虾给解释一下！！！！

万分感谢！！！！

唐三彩UID: 162984

看来确实够弱的，：-）对了，这些是机经吗？
1。a,b,c为15，17，19， 既然答案要的是a+b，所以为32；估计搂主看错题了。
2。题目是说，60%里有90%投了R的票，另外40%中的5%也投了R的票，这样就是54%+2%=56%的人投了R的票。

不知讲得是否满意。。。。

DajUID: 18915

thanks so much 唐三彩

your answer is perfect