The average (arithmetic mean) of 4 different integers is 72. If the largest integer is 90, what is the least possible value of the smallest integer?
Select the correct option:	A) 1	B) 19	C) 21	D) 30	E) 33

Rationale: total of integers = 72 * 4 = 288 lowest of the least possible integer is when the middle 2 intergers are at the maximum or equal to the highest possible integer . but all integers are distinct . so if the largest integer is 90 , then the middle 2 will be 88 and 89 lowest of least possible integer = 288 - ( 90 + 89 + 88 ) = 288 - 267 = 21 answer : c
Answer: C