Find the average of all the numbers between 9 and 26 which are divisible by 5.
Answers:
A) 15	B) 19	C) 18	D) 22	E) none

Rationale: "sol . average = ( 10 + 15 + 20 + 25 / 4 ) = 70 / 4 = 17.5 answer c"
Answer: C