A shopkeeper buys a number of books for . If he had bought more for the same amount each book would have cost less. How many books did he buy?
Step 1: Finding the cost of each book
Let a shopkeeper buys a number of books for .
Cost of each book
If he bought more books that is for the same amount
then cost of each book
Step 2: Finding the number of books he bought
each book would have cost less, then we get
Number of books cannot be negative
Therefore number of books shopkeeper buy is