The price of a bottle of cold drink is 10. One bottle of cold drink can also be bought by returning 10 empty bottles. A person has 1,000 and 19 empty bottles. Assuming that the person can consume any number of bottles he buys, what will be the number of empty bottles he possesses at the end if he buys maximum number of bottles of cold drink and consumes all?

The number of bottles of cold drink he bought for Rs. 1000 = 1000/10 = 100 Number of bottles of cold drink he bought from returning 100 empty bottles = 100/10 = 10 Number of bottles of cold drink he bought from returning 10 empty bottles = 10/10 = 1 Number he has total number of empty bottles = 19 + 1 = 20 He bought number of bottles from returning 20 empty bottles = 20/10 = 2 Now he has only 2 empty bottles.