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Puzzle Details

Alex likes soda very much. At the local convenience store, for every 5 empty soda bottles the reward is a full fresh bottle.

As part of a local recycling initiative Alex collected 77 empty bottles.

How many bottles of soda could Alex drink in total?

Puzzle Copyright © Kevin Stone

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Answer: 19 bottles.

From the initial 77 bottles, 15 full bottles are received (with 2 spare empty bottles).

From the 17 empty bottles, 3 more full bottles are received (with 2 spare empty bottles).

From the 5 empty bottles one final full bottle is received.

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