If the average (arithmetic mean) of (2a+16) and (3a-8) is 79, what is the value of a?  Choices.
A) 25	B) 30	C) 28	D) 36	E) 42

Rationale: "( ( 2 a + 16 ) + ( 3 a - 8 ) ) / 2 = ( 5 a + 8 ) / 2 = 79 a = 30 the answer is b ."
Answer: B