Here is a question about this article: Carnival was introduced by Portuguese settlers. The celebration is celebrated on each of the archipelago's nine inhabited islands. In Mindelo, Sao Vicente groups challenge each other for a yearly prize. It has imported various Brazilian carnival traditions. The celebration in SaoNicolau is more traditional, where established groups parade through the Ribeira Brava, gathering in the town square, although it has adopted drums, floats and costumes from Brazil. In Sao Nicolau three groups, Copa Cabana, Estrela Azul and Brilho Da Zona constructs a painted float using fire, newspaper for the mold, iron and steel to for structure. Carnival Sao Nicolau is celebrated over three days: dawn Saturday, Sunday afternoon, and Tuesday.
What is the answer to this question: How many of the inhabited islands is Carnival celebrated on?
nine