问题描述：
求问GRE猴哥数学难题112
17.The “combined age” of a group of people is the sum of the ages of all the
people in the group.Which of the following groups had the greatest combined age
in 1986?
A.20-year-old males B.20-year-old females
C.60- year-old males D.60-year-old females
E.80-year-old females
17.The “combined age” of a group of people is the sum of the ages of all the
people in the group.Which of the following groups had the greatest combined age
in 1986?
A.20-year-old males B.20-year-old females
C.60- year-old males D.60-year-old females
E.80-year-old females
问题解答：
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