The average (arithmetic mean) of 20, 40, and 60 is 4 more than the average of 10, 70, and what number? Options.
A) 28  B) 25  C) 35  D) 45  E) 55

Rationale: "a 1 = 120 / 3 = 40 a 2 = a 1 - 4 = 36 sum of second list = 36 * 3 = 108 therefore the number = 108 - 80 = 28 answer : a"
Answer: A