There were 91 books on a shelf. Twenty-eight of the books were nonfiction, 13 of the books were poetry books, and the rest were fiction books. How many books were fiction?

Respuesta :

randgh
Twenty-eight of the books were nonfiction
13 of the books were poetry books

28 +13= 41 

the rest are fiction 

91 -( 28 +13)= 50 books fiction