Alright here's a famous game that has been repeated a lot. I'm going to explain it and you guys can post the answer you're thinking of.
If you've seen this game already then please don't spoil the answer (there is a right answer)
Your answer is going to be 1 number between 0 and 100
What you're trying to do to win is get closest to 2/3 (two third) of the average of everyone's guesses
For shits and gigs, assume everyone is rational that you're against and they are also trying to guess a number closest to 2/3 of the average of guesses.
What would your pick be?