Question

After reading 7/9 of a book 40 pages are left.How many pages are their in a book?

Answer 1

let x be the TOTAL pages
given NO of books =1
7/9 of the book was readed then the remaining book is =1-7/9 =2/9
                2/9 = 40
                   1/9=40/2
                     1/9=20
       so the total book pages = 20 *9 = 180 pages                        

Answer 2

Given,

After reading 7/9 of a book 40 pages are left.

To Find,

How many pages are there in a book?

Solution,

We can solve the question as follows:

It is given that after reading 7/9 of a book, 40 pages are left. We have to find the number of total pages in the book.

The amount of book left to read will be equal to 7/9 subtracted from 1.

$Book\: left\: to\: read = 1 - \frac{7}{9} = \frac{2}{9}$

Let the total pages of the book be x. Now, 2/9 of the total pages is equal to 40 as 40 pages are left to read.

$\frac{2}{9}\: of\: x = 40$

$\frac{2}{9} *x = 40$

$x = 40*\frac{9}{2}$

$x = 20*9$

$x = 180$

Hence, there are 180 pages in the book.