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Puzzle - Answer

Sally likes soda very much. At the local convenience store, for 5 empty soda bottles she receives a full bottle.

As part of a local recycling initiative, she manages to collect 77 empty bottles.

How many bottles of soda will she be able to drink in total?

 [Ref: ZYYP] © Kevin Stone

Answer: 19 bottles.

From the initial 77 bottles, she receives 15 full bottles (with 2 spare empties). From the 17 empties, she receives 3 more full bottles (with 2 spare empties). From the 5 empties she receives one final full bottle.

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[Added September 1997]

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