Three men walk into a hotel and rent a room for Rs. 30. They contribute towards the room rent equally. So each one of the paid Rs. 10
The hotel manager after sometime realized the room rent should have been only Rs. 25 rupees. So he sent the dishonest bellboy and told him to give Rs. 5 back to the men.
The bellboy cheated and gave each one of them Re. 1 back.
Now you know Rs. 27 (10-1 = Rs. 9 each) is paid by the 3 men and Rs. 2 is with the bell boy. That makes it Rs. 29 (27+2), so where is the remaining Re.1