WHERE DID THE DOLLAR GO?

Three friends have a nice meal together, and the bill is 25$. The three friends pay 10$ each, which the waiter gives to the cashier. The cashier hands back 5$ to the waiter. 

But the waiter can't split 5$ three ways, so he gives the friends one dollar each and keeps 2$ as a tip.

They all paid 10$ and got 1$ back.  10$ - 1$ = 9$

There were three of them:  3 x 9$ = 27$

If they paid 27$ and the waiter kept 2$: 27$ + 2$ = 29$

Where did the dollar go?   30$ - 1$ = 29$