The average (arithmetic mean) of 20, 40, and 60 is 6 more than the average of 10, 70, and what number?
Select: A) 15 B) 25 C) 35 D) 22 E) 55

Rationale: "a 1 = 120 / 3 = 40 a 2 = a 1 - 6 = 34 sum of second list = 34 * 3 = 102 therefore the number = 102 - 80 = 22 answer : d"
Answer: D