A certain list consists of 21 different numbers. If n is in the list and n is 4 times the average (arithmetic mean) of the other 20 numbers in the list, then n is what fraction of the sum of the 21 numbers in the list? Select one of the following answer choices A 1/20 B 1/6 C 1/5 D 4/21 E 5/21 Submit Log in or register to post comments