Question

A shopkeeper buys a number of books for pc 8000 if he had bought 40 more books for the same amount it book would have cost rupees 10 days how many books did he buy

Answer 1

let number of books be x

8000/x+40-8000/x=10
 on solving it u will get  a quadratic equation as follows
x^2+40x-32000=0
on further solving it u will get 
x= 160
if correct pls mark brainliest

Answer 2

Let the shopkeeper had bought x numbers of books. And it costs 8000.
Now, if he will bought 40 more books then the total number of books would be (x+40) and it costs also 8000.
And from the question we can know that if he had bought 40 more books then the each book will cost 10.
From this we can build a equation -
x+40 = 8000÷10
=> x+40 = 800
=> x = 800-40
=> x = 760
So, from this we can know that the shopkeeper had bought 760 books.