If the average (arithmetic mean) of the four numbers 23, 15, 32, and (N + 1) is 50, then N =  Pick:
A) 19 B) 20 C) 121 D) 122 E) 129
23+15+32+N+1= 50 x 4 = 200   =&gt;N +71 = 200   =&gt;N=129   Answer 129
<result>E</result>
If the average (arithmetic mean) of the four numbers 23, 15, 32, and (N + 1) is 50, then N =