There were three people who went to sleep, Thirty yuan a night.

The three men each contributed 10 yuan to scrape together 30 yuan and gave it to the boss.

Then the boss said that today's discount as long as 25 yuan is enough,

Took out five dollars and ordered the waiter to return it to them,

The waiter secretly hid two dollars,

And then,

He divided the remaining three dollars among the three men,

Everyone gets 1 dollar.

In this way,

Each of you paid 10 dollars at the beginning,

And now I give back 1 dollar,

10-1 = 9,

It only cost 9 yuan per person,

Nine yuan each for three people.

3 X 9 = $27 + $2 hidden by the waiter = $29,

Where did the dollar go??