Simplify the following text for a Grade 5 native English-speaking person.
Original: American handball is played on a court 40 x with either a single ( front ) wall , three walls , or in a fully enclosed four-wall court ( the most common ) .
Simplified: American handball is played on a court 12.2 meters long by 6.1 meters wide ( 40 feet long by 20 feet wide ) with either a single ( front ) wall , three walls , or in a fully enclosed four-wall court ( the most common ) .