First, you need to know the total number of books she got:
42 sports book, 85 mystery books, and 69 nature books: So a total of:
42 + 85 + 69 = 196 books.
Those books need to be divided equally on 7 shelves. So you divide the total number of books by the number of shelves to find the number of books on 1 shelf.
196 / 7 = 28
So, on each shelf, there's 28 books.
Hope this Helps! :)
