If w, x, y, and z are integerssuch that 1 < w < x < y < z and wxyz = 462, then z =?
A. 7
B. 11
C. 14
D. 21
E. 42
【数学】
参考答案：B
题目翻译：wxyz大于一整数且依次从小到大，商是462，求z。
题目全解：分解462=2*3*7*11,选B。
In a corporation, 50 percent of the male employees and 40percent of the female employees are at least 35 years old. If 42 percent of all the employees are atleast 35 years old, what fraction of the employees in the corporation arefemales?
A. 3/5
B. 2/3
C. 3/4
D. 4/5
E. 5/6
参考答案：D
题目翻译：50%男和40%女35岁及以上，共42%35岁及以上，女的占公司多少。
题目全解：
男a女b, 0.5a+0.4b=0.42(a+b);得b=4a，b/(a+b)=4/5.
There are 11 women and 9 men ina certain club. If the club is to selecta committee of 2 women and 2 men, how many different such committees arepossible?
A. 120
B. 720
C. 1,060
D. 1,520
E. 1,980
参考答案：E
题目翻译：11女9男，选2男2女，几种选法?
题目全解：C(2,11)*C(2,9)=(11*10*9*8)/4=1980