If the average (arithmetic mean) of (2a+16) and (3a-8) is 89, what is the value of a? Choose one.
A) 25
B) 30
C) 28
D) 34
E) 42
((2a+16) + (3a-8)) / 2 = (5a+8)/2 = 89   a= 34   The answer is 34.
<result>D</result>
If the average (arithmetic mean) of (2a+16) and (3a-8) is 89, what is the value of a?