In a certain Library, there are r bookcases with s shelves in each book case. If a total of b books is to be distributed among the shelves, What is the number of books per shelf?

a) b/rs
b) rb/s
c) rsb
d) r/s-b
e) b/s-r

b/rs

To determine the number of books per shelf in the library, we need to divide the total number of books, b, by the total number of shelves, which is r multiplied by s.

So, the correct option would be:

a) b/(r * s)

Explanation:

To find the number of books per shelf, we divide the total number of books (b) by the total number of shelves (r * s), which gives us b/(r * s).