GWD 逻辑题求助

luyiqing

GWD-9-Q13:
Fact: Asthma, a bronchial condition, is much less common ailment than hay fever, an allergic inflammation of the nasal passages.
Fact: over 95 percent of people who have asthma also suffer from hay fever.
If the information given as facts above is true, which of the following must also be true?

A.    Hay fever is a prerequisite for the development of asthma
B.    Asthma is a prerequisite for the development of hay fever
C.    Those who have neither hay fever nor asthma comprise less than 5 percent of the total population
D.    The number of people who have both of these ailments is greater than the number of people who have only one of them
E.    The percentage of people suffering from hay fever who also have asthma is lower than 95 percent.
E是正确的，其他几个选项怎么排除呀，思路是什么？
帮忙解答一下，谢谢啦

W...

alwynzhang 发表于 2010-8-14 11:11
其实在草稿纸上画两个交叉的圆，一个大圆代表HAY FEVER（X)，一个小圆是ASTHMA(Y)，中间交叉的部分就是HAFY ...

同意！               

CCcarol

感谢解答！！！~

caoqin1981

但是我首先题目一上来看到AB正好说的相反，所以就认定必定在二者之间选，排除了CDE，有人给说说A,B吗

lllmmm

此题画个 韦恩图 会很快出结果

flewrudy

为什么我觉得这个推不出来的啊，99/100=0.99>0.95,99/101=0.9801>0.95....

我觉得是这样的，还是画圆，三个圆，200人，值得asthma的4人，都得的96个，剩下100个的hf，这样子，96/100》0.95，96/(100+96)《0.95了

rongyang114

THANKS

alwynzhang

其实在草稿纸上画两个交叉的圆，一个大圆代表HAY FEVER（X)，一个小圆是ASTHMA(Y)，中间交叉的部分就是HAFY FEVER-ASTHMA(Z)。
用数学公式表示就是
Z/Y>95%，因为X>Y，所以很明显Z/X<95%。
其实大家照我说的画个图就很直观了。很简单的数学分析。

JHN1989

顶  
谢谢解答

luyiqing

恩，谢谢了