If the average of 9 consecutive number is T How much will the average increase by if the next 3 cons...........

Quant (SSC) Average

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?

1.5

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Explanation:

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