Conversation so far:
who is getting promoted to the premier league
The promoted teams for the 28th season of the Premier League are Norwich City, Sheffield United and Aston Villa.
how long were norwich city, sheffield united and aston villa absent from the premier league
Norwich City and Aston Villa return to the top flight after absences of three years from the Premier League, while Sheffield United return after a twelve year absence.
who did norwich city, sheffield united and aston villa replace in the 2019-20 premier league
Norwich City, Sheffield United and Aston Villa replaced Cardiff City, Fulham and Huddersfield Town in the Premier League
who are the london teams in the 2019-20 premier league
The London teams in the Premier League are Arsenal, Chelsea, Crystal Palace, Tottenham Hotspur, and West Ham United

Question: how many teams compete in the league
Self-contained rewrite: how many teams compete in the premier league