GMAT Pre Math (Please teach me !)ThX!

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maypoon

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发表于 2009-2-1 22:39:00 | 只看该作者

GMAT Pre Math (Please teach me !)ThX!

Dear all,

Please teach me how to deal with the following questiones!Thank you so much !

Q1. A certain roller has 3 cars, and a passenger is equally likely to ride in any 1 of the 3 cars each times that passenger rides the roller coaster. If a certain passenger is to ride the roller coaster 3 times, what is the probability that passenger will ride in each of the cars?

A. 0
B. 1/9
C. 2/9
D. 1/3
E. 1
Ans : C

Q.2 There 're 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 1 paperback?

A. 40
B. 45
C. 50
D. 55
E. 60
Ans. C

Q3. 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
Ans. D

Q4. In town X, 64% of the population are employed , and 48% of the population are employed males. What % of the employed people in town X are females?

A. 16%
B. 25%
C. 32%
D. 40%
E. 52%
Ans: B
(Why the answer isn't C)

Q5. How many integers from 0 to 50 , inclusive , have a reminder of 1 when divided by 3?

A. 15
B. 16
C. 17
D. 18
E. 19
Ans: C
(Why not B??)