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?  Choose the most appropriate option:
A) 1	B) 19	C) 21	D) 30	E) 33
Total of Integers=72*4= 
<gadget id="calculator">72*4</gadget>
<output>288</output>
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= 
<gadget id="calculator">288-267</gadget>
<output>21</output>
21   Answer: 21
<result>C</result>
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?