GWD-9-Q13

GWD-9-Q13:  E

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?

1. Hay fever is a prerequisite for the development of asthma

2. Asthma is a prerequisite for the development of hay fever

3. Those who have neither hay fever nor asthma comprise less than 5 percent of the total population

4. The number of people who have both of these ailments is greater than the number of people who have only one of them
5. The percentage of people suffering from hay fever who also have asthma is lower than 95 percent.

哪位能帮我解说一下吗？偶脑子转不过来了

转化为数学题目～

AB首先排出；无关。

C因为总百分比不清除，也推不出来。

D也不能推出。因为hay fever可能100%在asthma中。

答案不是E么？

答案是E

n个A病人中患有HF的超过95%,因此患有A且患有HF的病人人数大于95%n

由于患A病的人比患HF病的人少( Asthma is much less common ailment than hay fever),假设患HF病的有x个人,那么n<x

==>(95%n)/x<95%

说的真明白！

多谢

"Much less common" is a key point to get "must true" answer-E.