How many preludes and fugues are included in the well tempered clavier volumes?

The Well-Tempered Clavier, composed by Johann Sebastian Bach, consists of two sets of 24 preludes and fugues in all 24 major and minor keys. Each set is known as a "volume" or "book." Therefore, the complete Well-Tempered Clavier comprises a total of 48 preludes and 48 fugues, spread over two volumes.