Answer:
180
Step-by-step explanation:
Let the total pages in a book be x.
Riya read 7/9 of the book = 7x/9
Fraction of the pages left unread = 1 - 7x/9 = 2x/9
Given that 40 pages left unread, implies that
2x/9 = 40
2x = 40 × 9
Divide both sides
x = 360/2 = 180
Hence, the books has 180 pages in total.
