GWD一道逻辑求助~~~不解不解！！！

dolorez · 发表于 2009-12-21 21:40:46

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 is following must also be true?
A. Hay fever is a prerequiste for the development of asthma.
B. Asthma is a prerequiste for the development is 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 ailment is greater than the number of people
who have only one of them.
E. The percentage of people suffering fron hay fever who also have asthma is lower than 95 percent.

guoguotoronto · 发表于 2009-12-21 23:42:36

这两种病的关系可以画个图来表示，他们之间有相交的部分，因为其中一个病更普遍，即他们拥有同样的分子，即相交部分，但更普遍那个病的分母相对更大，所以比例会低于95%。不知我有没有说清楚，反正这道题没有对我造成困扰。

sprtng · 发表于 2009-12-22 02:52:07

楼上说的很对。。。说是hayfever患者比asthma患者要多很多，那既然95%的asthma患者也是hayfever患者那如果说95%的hayfever患者也是asthma患者的话那hayfever患者跟asthma患者的数量就相等了～如果要hayfever 患者比asthma患者多很多的话，只有这个hayfever患者得asthma的比例比95低了～

girlwithwings · 发表于 2009-12-23 14:40:56

E选项

设A=1 , then F>1,

A*95% =95% = A交F =F * X %

所以 X% < 95%

GWD一道逻辑求助~~~不解不解！！！

这道题选E是正确的

所属分类: GMAT考试

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