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?
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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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