Question

How to solve the sum of a boy reads 2/5 of a book. he finds 150 pages remaining to read how many pages are there in the book?

Answer 1

let total pg= x
pages read=2/5of x=2x/5
so, total page - no. of pages read=150
x - 2x/5 =150
=3x/5 = 150
=x=150 * 5/3
x=250 pages

so total pgs=250 pages 
 
take total pages as x

Answer 2

There are 250 pages in the book