[問題]GWD26-1

[amyliang]

Q1:
At a certain company, the average (arithmetic mean) salary of 10 of the employees is $30,000, the average salary of 30 other employees is $40,000, and the average salary of the remaining 20 employees is $60,000. What is the average salary of the 60 employees at the company?

A. $40,000
B. $43,000
C. $45,000
D. $60,000
E. $65,000

Ans:C

我不知道 是我白癡到極點還是怎樣
我竟然算不出來這題的答案
我的算法是(10*30k+30*40k+20*60k)/60=90,000
答案裡沒有.....哇咧......到底是那裡錯了呢???

[Huang Hsin-Yi]

你列的式子沒錯,只是算錯了,再算一次巴

[smilego]

應該是第1個計算錯誤了
300,000+1,200,000+1,200,000=2,700,000
再除60就是答案了