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标题: GWD9—13 [打印本页]

作者: maggie0406 时间: 2009-11-18 00:32
标题: GWD9—13
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.

who can explain why is E?

作者: genius_fang 时间: 2009-11-18 00:49
假设有X人得A疾病，Y得H疾病，有题目知道X<Y，且95%X的人两种病都有，那么0.95X/Y是不是<0.95呢？选E啦~

作者: maggie0406 时间: 2009-11-18 01:02
哦
原来是道数学题
天才指路~

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