the average of the first 5 multiples of 9 is :	Answers: A) 20 B) 27 C) 28 D) 30 E) none of these

Rationale: solution : required average = ( total sum of multiple of 9 ) / 5 = ( 9 + 18 + 27 + 36 + 45 ) / 5 = 27 note that , average of 9 and 45 is also 27 . and average of 18 and 36 is also 27 . answer : option b
Answer: B