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11/09/2011 9:16:08 AM EST
u can buy 15 from the 15 rs. you have. then you can exchange wrappers for 5 chocolates. therefor, 15+5=20. then you can exchange only 3 wrappers for another 1 chocolate. that makes the count 21. then, the one wrapper of the last chocolate and 2 of the previous ones can help us buy another chocolate. thus, in all, we can get 22 chocolates.