Each employee of a certain company is in either Department X or Department Y,
and there are more than twice as many employees
in Department X as in Department Y.
The average (arithmetic mean) salary is $25,000
for the employees in Department X
and $35,000 for the employees in Department Y.
Which of the following amounts could be the average salary
for all of the employees of the company?
Indicate all such amounts.
(A) $26,000
(B) $28,000
(C) $29,000
(D) $30,000
(E) $31,000
(F) $32,000
(G) $34,000
今天晚上去听创胜文教 NTE 的免费讲座，
老师讲解这题时说答案是 CDEFG，课上有同学回答是 AB，但被老师说错。
我自己算也是算 AB，不知是否有板友能解答究竟为何是 CDEFG，感谢！