求救,2道prep的数学

hilarypei · 发表于 2011-9-1 16:46:15

1. 为什么 In country x, of the population 65 years old or older, 20% of the men and 10% of the women are employed. 能推出来 at least 10% of the people in Country X who are 65 years old or older employed?

2. 为什么In the survey, 36% of the men and 50% of women said that they considered engaging in research an essential goal.
能推出 Of the 1400 college teachers surveyed, 42% said that they considered engaging in research an essential goal. How many of the college teachers surveyed were women?

谢谢~~~

catherineyang · 发表于 2011-9-1 16:53:46

是不是这个样子的，，，
第一题：在X国家，所有65和以上的人中，假设极限情况没男的，都是女的，被雇佣的至少是10%把。。。（考虑多点儿就是假设没女的，都男的，至多20%吧）

所以是充分的

catherineyang · 发表于 2011-9-1 16:56:24

第二题：
男+女=1400
42%*1400=女*50%+男*36%

解方程

hilarypei · 发表于 2011-9-1 17:29:34

谢谢楼上!!!
原来第二题那么简单...做晕了... 呵呵

求救,2道prep的数学

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