Total Runners In The School

Read the given data first!
 
This could be very tricky one. Let's assume that the Matt is fifth fastest and fifth slowest runner in his school.

Then there are 4 runners ahead of him numbered 1 to 4 and 4 behind him numbered 6 to 9. So there would be total 9 runners in his school in the case.

But Matt is 50th fastest runner meaning 49 are ahead of him numbered 1 to 49. And 49 are behind him numbered as 51 to 99 (total 49) while Matt is at 50th position.

Hence, there are 49 + 1 + 49 = 99 runners in his school.