So in a given spot, say I raise and bttn/bb call

flop is xxx

I cbet 50%, and estimate that each player folds 50% of their given range.

What would be the cbet success frequency?

Basically, I'm thinking it would be 50%, because 50(fold)+50(fold)/2=50

But i am thinking I'm doing something wrong, because under this logic, say in a 9 way pot, if each player was to fold 50%, then i would still have a 50% success frequency, which I am assuming is not correct. (50*9)/9=50.....

Someone please correct me :)