find the average of all the number between 6 and 34 which are divisible by 5.  Choose the correct choice
A) 18  B) 20  C) 24  D) 30  E) 32

Rationale: "solution average = ( 10 + 15 + 20 + 25 + 30 / 5 ) = 100 / 2 = 20 answer b"
Answer: B