The average (arithmetic mean) of 24, 35, and 58 is 6 more than the average of 19, 51, and x. What is x?
Choose the correct choice from the following answers
A) 26 B) 27 C) 28 D) 29 E) 30

Rationale: "the average of 24 , 35 , and 58 is 39 . the average of 19 , 51 and x is 33 . then 19 + 51 + x = 99 . x = 29 . the answer is d ."
Answer: D