2. 外语
  3. Of the 400 cadets in a graduating class, 30 percent were women and, of these, 1/5 became instructors. If the number of men who b

Of the 400 cadets in a graduating class, 30 percent were women and, of these, 1/5 became instructors. If the number of men who b

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问题 Of the 400 cadets in a graduating class, 30 percent were women and, of these, 1/5 became instructors. If the number of men who became instructors was twice the number of women who became instructors, how many of the men became instructors?
选项 A、120
B、48
C、40
D、24
E、20
答案B
解析 在一个拥有400名警察的毕业班中，30％是女生，并且在这些女生中，有1/5的人当教师。假如男生中当教师的人数是女生中当教师的人数的两倍，问有多少男生当教师?
解：本题的正确答案是(B)。根据题意可得：男生当教师的人数=400×30％×1/5×2=48。
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