Prep DS1-64

scorpio2rd

64.   5320-!-item-!-187;#058&004563

Are at least 10 percent of the people in Country X who are 65 years old or older employed?

 

(1) In Country X, 11.3 percent of the population is 65 years old or older.

 

(2) In Country X, of the population 65 years old or older, 20 percent of the men and 10 percent of the women are employed.

Answer: B

没有人问过...但是实在不知道B是怎么得出来的...求教......!!!

Wilt

men20%，women10%可以推出总体大于10%，极限法

wawadream

agree with Wilt:

if the amount of man is a and woman is b, then according to 2, the question actually is: if (20%*a+10%*b)/(a+b)>10%

20%*a+10%*b=(10%*a+10%*b)+10%*a

so the (20%*a+10%*b)/(a+b)=10%+10%*a/(a+b)>10%