问题

The combined age of a group of people is the sum of the ages of all of the people in the

The "combined age" of a group of people is the sum of the ages of all of 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

参考答案

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