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.
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.