The average (arithmetic mean) of 10, 20, and 60 is 5 more than the average of 10, 40, and what number?	Choose the correct choice from the following choices:
A) 25  B) 60  C) 50  D) 30  E) 40

Rationale: "a 1 = 90 / 3 = 30 a 2 = a 1 - 5 = 25 sum of second list = 25 * 3 = 75 therefore the number = 75 - 50 = 25 a"
Answer: A