Mohan rao took 10 days to finish a book, reading 40 pages every day. How many pages must he read in a day to finish it in 8 days?

Solution

Let us suppose Mohan rao will have to read x pages every day to finish the book in 8 days.
As the number of days decreases, the number of pages increases.
So, the number of days and number of pages are in inverse proportion.
∴ 10 × 40 = 8 × x
x=400/8
⇒ x = 50 pages
Hence, Mohan rao will have to read 50 pages every day to finish the book in 8 days