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
今天晚上去聽創勝文教 NTE 的免費講座，
老師講解這題時說答案是 CDEFG，課上有同學回答是 AB，但被老師說錯。
我自己算也是算 AB，不知是否有板友能解答究竟為何是 CDEFG，感謝！