The number of pages...

Each team page has 15 teams, so I skip to the last page and do the maths.

But there could be a page with under 15 pages...

So say there are 7000 pages and the 7000th page has only 5 teams.

Then to calculate the number of teams,

6999 pages are filled with 15teams each and the 7000th page has only 5 teams.

So I do the maths,

6999 x 15 = 104985

And to that number I add 5 because of the 5 teams in the 7000th page,

104985 + 5 = 104990 teams

(Just an example)