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标题: GWD-2 q26,q27 [打印本页]

作者: AlphaBeta 时间: 2006-8-16 06:58 标题: GWD-2 q26,q27

Does anyone know how to solve it?

Thank you very much!!!

Q26:

There are 8 books on a shelf, of which 2 are paperbacks and 6 are hardbacks. How many possible selections of 4 books from this self include at least one paperback?

A. 40

B. 45

C. 50

D. 55

E. 60

Q27:

In a corporation, 50 percent of the male employees and 40 percent of the female employees are at least 35 years old. If 42 percent of all the employees are at least 35 years old, what fraction of the employees in the corporation are females?

A. 3/5

B. 2/3

C. 3/4

D. 4/5

E. 5/6

作者: smalllittle 时间: 2006-8-16 20:05

Q26,

C(8,4)-C(6,4)=55

Q27,

50%*male+40%female = 42%*(male+female)

=> 8%male = 2%female => 4male=female

=> female/(male+female)=4male/(male+4male)=4/5

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