Find the average of all the numbers between 6 and 34 which are divisible by 5  Choose the correct choice.
A) 18	B) 20	C) 24	D) 30	E) 40

Rationale: "exp . multiples of 5 between 6 and 34 are 10 , 15,20 , 25,30 average = ( 10 + 15 + 20 + 25 + 30 ) / 5 = 5 ( 10 + 30 ) / 2 * 5 = 40 / 2 = 20 answer : b"
Answer: B