If the average of 8 digits is 20 and the average of 5 of them is 12, calculate the average of the remaining 3 numbers?
Pick: A) 13.3 B) 38.3 C) 35.3 D) 31.3 E) 33.3

Rationale: "explanation : total of the 8 digits - 8 * 20 = 160 total of the 5 digits - 5 * 12 = 60 total of the remaining 3 digits - 160 - 60 = 100 average of the remaining 3 numbers = 100 / 3 = 33.3 answer : e"
Answer: E