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3 girls share a room at 30$, they pay 10$ each.The tender feel guilty and send the janitor to give back 5$, on his way to the room he realise that he cant equaly split the 5$ in 3 so he decide to keep 2$ and give the girls 1$ each.
The girls paid 9$ each that's 27$ +the 2$ the janitor kept make it 29$.
Where is the missing 1$?
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