The average (arithmetic mean) of 20, 40, and 60 is 5 more than the average of 10, 70, and what number?	Select:
A) 15 B) 25 C) 35 D) 45 E) 55

Rationale: "a 1 = 120 / 3 = 40 a 2 = a 1 - 5 = 35 sum of second list = 35 * 3 = 105 therefore the number = 105 - 80 = 25 answer : b"
Answer: B