Counting from the start of the first Formula One season in 1950, and including the 12 races that have been run in the 2013 season as of the time of this answer, there have been a total of 890 Formula One races.
16 teams.
16 teams
The usual amount of teams in 11 or 12.
204 teams.
In the 1930 world cup there were 13 teams.
almost 300 in the 12 men's teams and 12 women's teams
They didn't have teams then. The athletes competed individually - not even 'representing' their town/city.
There were thirty-two teams who competed. This number allows for a standard tournament bracket. 32-16-8-4-2-1.
There are many teams who play in the Football Confederations Cup. In the year 2012, there were 16 different football teams that competed in the competition.
I believe the answer is 20. Hope this helps :)
34
Japan has competed in the Olympics since 1912 so that's 100 years exactly :)