Question

On his shelves, Trenton had 15 biographies, 15 science fiction, 7 reference, and 11 mystery books. Find the ratio of biographies to the total number of books.

Answer 1

There are 15 biography books and there are 48 books in total so the ratio is 15:48

Answer 2

Lets look at the info we have:- 

15 biographies 
15 science fiction
7 reference 
11 mystery books 

We know he has 15 biographies. So, lets add to find out how many books he has in total.

15 + 15 + 7 + 11 = 48
48 books in total. 

So lets write our ratio:-

15 biographies 
48 books in total.

15 to 48
15:48
15/48

Hope I helped ya!! xD