400-600-1123
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答案：
A
50%是college g
raduates， 60% over 40 years old，如果over 40的人当中的30%有master’s degress，问有多少个大于40岁且拥有master学位的
（1）一共有100个employees，那么over 40的人有40个，其中有master学位的有40*30% 12个，充分
（2）40岁左右的，有25%的人用master学位，条件不充分很明显求不出答案
选a 
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