The average (arithmetic mean) of 10, 30, and 50 is 8 more than the average of 20, 40, and x. What is x? Answers:  A) 2  B) 4  C) 6  D) 8  E) 10
The average of 10, 30, and 50 is 30.   The average of 20, 40 and x is 22.   Then 20 + 40 + x = 66.   x = 6.   The answer is 6.
<result>C</result>
The average (arithmetic mean) of 10, 30, and 50 is 8 more than the average of 20, 40, and x. What is x?