[X] Common Answers
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Three people check into a hotel.
They pay £30 to the manager and go to their room.
The manager suddenly remembers that the room rate is £25 and gives £5 to the bellboy to return to the people.
On the way to the room the bellboy reasons that £5 would be difficult to share among three people so he pockets £2 and gives £1 to each person.
Now each person paid £10 and got back £1.
So they paid £9 each, totalling £27. The bellboy has £2, totalling £29.
Where is the missing £1?