Can you find out the total number of pages in the book?

Question

On the first day, James read 20% of a book. On the second day, he read another 66 pages and discovered that he had read 80% of the unread pages. What is the total number pages of the book?

Answer 1

ans :330
explain
1st day read=20%
2nd day read=66 page
remaining =80%
20%+80%=100%
so 1st and 2nd read same page that is 66
let assume total page=x
80x/100+66=x
4x/5+66=x
(4x+330)/5=x -> 330=5x-4x
x=330

reverse

 20*330/100=66page