The book has 80 pages. The story is 19 pages. How much of the entire book is the story?

We know that there are 80 pages in the book, and the story is 19 pages long. So, in order to find out what part the story takes, you need to divide the number of pages that the story takes by the number of all pages in the book, we get the following:
19 ÷ 80 = 19/80 part
That is, the story takes 18/90 part of the entire book.
Answer: the story takes part 18/90.