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

let the number of pages in a book = x
reading pages = 7/9*x = 7x/9
page left = 40

so
x - 7x/9 = 40
(9x - 7x)/9 = 40
3x/9 = 40
3x = 40*9 = 320
x = 360/3
x = 120

Hence there are 120 pages in a book. 

 
  • -4
Let the total number of pages in the book be x
Fraction of pages read- 7/9
Fraction of pages remaining- 7/9 - 1
                                              7/9 - 9/9
                                             =2/9
No. of pages remaining- 40
Therefore, we can say that 2/9x= 40
                                         x=40*9/2
                                        x=20*9
                                       x=180

Therefore, there are 180 pages in the book.
 
  • 12
nice question .
  • 0
Nice question
  • -1
let the number of pages in a book = x reading pages = 7/9×x = 7x/9 page left = 40 so x - 7x/9 = 40 (9x - 7x)/9 = 40 3x/9 = 40 3x = 40×9 = 320 x = 360/3 x = 120
  • 1
Nice question
  • 1
180 pages are left
  • 1
What are you looking for?