Four-fifths of Kayla’s Math Notebook is filled. She has written on 48 pages. How many pages is there

Four-fifths of Kayla’s Math Notebook is filled. She has written on 48 pages. How many pages is there total in the notebook?

Let the total pages be p. WE're given:
4p/5 = 48

To solve for p, we type this equation into our search engine and we get:
p = 60