Answer :
50 Because
The average of 1 and 99 is 50
The average of 2 and 98 is 50
...
The average of 49 and 51 is 50
The average of 50 is 50
The average of 1 and 99 is 50
The average of 2 and 98 is 50
...
The average of 49 and 51 is 50
The average of 50 is 50
That's the only way possible, here 1 sec lemme look it up to see if their is any other way... I know their is I just don't remember it... Lol