query: How many players does each team have on the field in an American football game?
passage: American football
A football game is played between two teams of 11 players each.[32][33][34] Playing with more on the field is punishable by a penalty.[32][35][36] Teams may substitute any number of their players between downs;[37][38][39] this "platoon" system replaced the original system, which featured limited substitution rules, and has resulted in teams utilizing specialized offensive, defensive and special teams squads.[40]
passage: Nine-man football
The size of the playing field is often smaller in nine-man football than in 11-man. Some states opt for a smaller, 80-yard-long by 40-yard-wide field (which is also used in eight-man and six-man); other states keep the field of play at the standard 100 yards long while reducing the width to 40 yards, some even play on a full-sized playing field (with the 53 1/3 yard-wide field). In games played on 80-yard fields, kickoffs take place from the 20-yard line rather than from the 40-yard line.