There are three people to go to the hotel, living in three rooms, $ 10 each room, so they pay for the boss $ 30,
The next day, the boss felt that the three rooms only need $ 25 yuan enough to call the younger brother to return $ 5 for three guests.
Who knows that the younger brother is greedy, only returning to $ 1 each person, secretly took $ 2, so that the three guests have spent 9 yuan each.
So three people spent $ 27, plus the younger brother an independent of $ 2, a total of $ 29. However, when they had a total of $ 30, there were $ 1?
