Three guys go to a restaurant and the bill ends up being $30.
They each pay $10.
The waiter takes the money to the cashier
who says that it should have been $25 instead of $30.
The waiter takes $5 back to the three guys
and gives them each $1 and keeps $2 for himself.
They have each now paid $10 minus $1 = $9.
3 x 9 = 27
+ 2 (that the waiter kept) = $29.
But they paid $30.
Where is the missing dollar?
