One of the problems with just talking numbers of aircraft in a fleet is that it takes no account of what I call military productivity.
How many WWII aircraft did it take to be sure to take out a bridge? – answer sometimes more than we had. How many aircraft with LGBs does it take to do the same thing today? – answer one.
How many F-16s will it take to have the same military capability as an F-35? - answer I don’t know but I would be surprised if it was not quite a few.
(Indeed it may even be that any number of F-16s could not do the job that one F-35 could do. Modern kit has amazing capabilities)