# Please I need help for the number one question in my mathematics ?

##### 1 Answer

Apr 5, 2018

63 books where each one is 4 cm wide

#### Explanation:

Each book is 3cm wide. There is a count of 84 books so the shelf length is

We change the books to ones that are 4cm thick.

The count of these books is

Did you know you can cancel out units of measurment the same way you can numbers?

You can not but