猴哥一道题，求问

xixi12UID: 3327820

Of the 500 delegates attending a convention,200 are Republicans and the rest are Democrats.One hundred of the delegates are vegetarians and,of those who are not vegetarians,270 are Democrats.how many of the vegetarian delegates are Republicans?
A30
B40
C50
D60
E70
ps：我竟然没读懂题的意思

brooksideUID: 3627142

E

所有人有两种分类方法，一种是按党派：200 republican, 300 democratic,
一种是按是否素食：100 vegetarian, 400 non-veg.
在non-veg 中有270个是demon------->130个repub是non-veg---------->70个repub是veg.

哈，你肯定是没看懂，不然这道题里的数学知识你肯定没问题。

xixi12UID: 3327820

brookside 发表于 2015-8-25 04:17
E

所有人有两种分类方法，一种是按党派：200 republican, 300 democratic,

是啊，of those who are not vegetarians,270 are Democrats这个就晕了。不知道270指哪个

海上钢琴师1900UID: 2379482

xixi12 发表于 2015-8-25 13:33
是啊，of those who are not vegetarians,270 are Democrats这个就晕了。不知道270指哪个

就是non-veggie中有270个Democrats