One full bottle of Soft drink for five empty bottles puzzle

Soft Drink Bottle Puzzle


A shopkeeper gives a full bottle of soft drink in return for five empty bottles.

A guy has 77 empty bottles and he can use them to get full soft drink bottles.

How many filled bottles will he be able to get from the shopkeeper?


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The Guy can get 19 filled bottles from the shopkeeper.
First he returns 75 empty bottles and gets 15 full soft drink