of the participants came st or higher.
Oh, I went with the assumption that there were no tied scores. If there could be tied scores, there is no way of telling, so I think the assumption is logical.
We are told that Jack's position of 22nd was just behind the position of out of every people that took the quiz. This means that the people that have surpassed Jack's position make up of the total participants.
I let the total number of participants.
because Jack was position behind of the total amount of people taking the quiz.