If the average of 9 consecutive number is T. How much will the average increase by if the next 3 consecutive numbers are also added?	Pick:
A) 3
B) 1.5
C) 2.5
D) Can’t be determined
E) None of these
DETAILED SOLUTION   Let the numbers be n, n+1, n+2……………….n+8   Average of these numbers = n + 4   When n +9, n+10, n+11 are added, the difference of these numbers from the earlier average = 5, 6, 7 respectively = 18   This 18 will increase the average by 18/15 = 1.5   CORRECT ANSWER 1.5
<result>B</result>
If the average of 9 consecutive number is T. How much will the average increase by if the next 3 consecutive numbers are also added?