Find the average of all the numbers between 6 and 39 which are divisible by 5?
Choose the most appropriate option.
A) 10
B) 20
C) 25
D) 30
E) 23

Rationale: "average = ( 10 + 15 + 20 + 25 + 30 + 35 ) 6 = 135 / 6 = 23 answer is e"
Answer: E