If the average (arithmetic mean) of (2a+16) and (3a-8) is 84, what is the value of a? Options
A) 25	B) 30	C) 28	D) 32	E) 42

Rationale: "( ( 2 a + 16 ) + ( 3 a - 8 ) ) / 2 = ( 5 a + 8 ) / 2 = 84 a = 32 the answer is d ."
Answer: D