Bunuel wrote:
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) $50,000
(E) $55,000
We can create the following equation for a weighted average:
(10 x 30,000 + 30 x 40,000 + 20 x 60,000)/60
(300,000 + 1,200,000 + 1,200,000)/60
2,700,000/60
...
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