新prep 两道题 求解~！！！

ulaulah

第一题：When 1000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever?
(1) 880 children developed neither inflammation nor fever.
(2) 20 children developed fever.
这题答案是 C


第二题：
Of the students who eat in a certain cafeteria, each student either likes or dislikes lima beans and each student either likes or dislikes brussels sprouts. Of these students, 2/3 dislike lima beans; and of those who dislike lima beans, 3/5 also dislike brussels sprouts. How many of the students like brussels sprouts but dislike lima beans?
(1) 120 students eat in the cafeteria.
(2) 40% of the students like lima beans.
这题答案是 D


感觉这两道题是同一个类型，好像都是韦恩图，但是我不知道怎么画图才能求出来啊。。。求解


thanks very much~~~~

ulaulah

UP UP!!!

LeoWen

http://forum.chasedream.com/GMAT_Math/thread-434042-1-1.html?postid=13815720&searchmode=TopicContent&searchtext=children were inoculat
这是以前别人讨论的帖子，参考之后仍不得其解。画韦恩图解决，但我觉得真谛是：fever包含在inflammation里面，故选C，如果是传统的两圆相交肯定选E。参考：Asthma, a bronchial condition, is much less common ailment than hay fever, an allergic inflammation of the nasal passages. 发烧肯定发炎，但发炎不一定发烧！may it help！

andyboffins

第二题。。。我也错了。。。。怎么解出来啊？？？求助

talentzou

andyboffins 发表于 2012-11-29 23:46
第二题。。。我也错了。。。。怎么解出来啊？？？求助

第二题的 （2）楼主写错了，不是40%，是40
(2) 40 of the students like lima beans.