Question

The front and back covers of a textbook are each 0.3 cm thick . Between the covers are 200 sheets of paper , each 0.008 cm thick . How high is a stack of 10 books?

1. Given the thickness of the textbook covers and the sheets of paper between them, the height of 10 stacked books is 22 cm.

### How high is a stack of 10 books?

Given the data in the question;
• Height of front cover of a book = 0.3cm
• Height of back cover of a book = 0.3cm
• Height of a sheet of paper between the cover = 0.008cm
• Number of papers between the cover = 200
• Height of 10 stacked books = ?
First we determine the height one book.
Height of one book =  Height of two covers + Height of 200 sheets of paper between the cover.
Height of one book = ( 0.3cm + 0.3cm ) + 200( 0.008cm )
Height of one book = 0.6cm + 1.6cm
Height of one book = 2.2cm
Now, height of 10 stacked books will be;
H = 10 × 2.2cm
H = 22cm
Given the thickness of the textbook covers and the sheets of paper between them, the height of 10 stacked books is 22 cm.