Question

After reading 7/9 of a book , 40 pages are left .How many pages are there in the book ?
140
180
90
None of these

Answer 1

Answer:

LET THE NUMBER OF PAGES BE X

NUMBER OF PAGES READ = 7/9 OF X

NUMBER OF PAGES REMAINING = 40

X - 7/9 X = 40

X^2 - 7 / 9X = 40

X^2 - 7 = 360 X

X^2 - 360X - 7 = 0

X = 180

Answer 2

let there be x pages in the book.

(7//9) of x = x-40

7x/9=x-40

7x=9x-360

360=9x-7x

360=2x

x=180

so there are 180 pages in the book.

Hope it helps you ❤️❤️❤️