The average (arithmetic mean) of 10, 30, and 50 is 8 more than the average of 20, 40, and x. What is x? Pick
A) 2	B) 4	C) 6	D) 8	E) 10

Rationale: "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 c ."
Answer: C