If the average (arithmetic mean) of the four numbers 3, 16, 33, and (N + 1) is 20, then N =
Choices:
A) 19  B) 20  C) 21  D) 27  E) 29
3+16+33+N+1= 20 x 4 = 80   =&gt;N +53 = 80   =&gt;N=27   Answer 27
<result>D</result>
If the average (arithmetic mean) of the four numbers 3, 16, 33, and (N + 1) is 20, then N =