The average (arithmetic mean) of 20, 40, and 60 is 7 more than the average of 10, 70, and what number?	Select: A) 19 B) 25 C) 35 D) 45 E) 55

Rationale: "a 1 = 120 / 3 = 40 a 2 = a 1 - 7 = 33 sum of second list = 33 * 3 = 99 therefore the number = 99 - 80 = 19 answer : a"
Answer: A