3 girls go to a motel. The front desk clerk tells them the room will cost $30 for the night. Each girl gives $10 to make out the 30.

Later that night, the clerk realized that the room was actually $25, not 30. So, he calls one of his co-worker and give him $5 to return to the girls.

On his way, the co-worker ask himself:" How am I going to share $5 to 3 girls?" So, he decides to give each $1 and keep the extra $2 for himself.

So, each girl actually paid $9 for the room ($10-$1). So, the total should be $9+$9+$9 = $27. If we add the $2 that the co-worker kept, we get $29.

The question is: "WHERE IS THE MISSING DOLLAR??"

They paid thirty dollars. Five was refunded. That leaves 25 with the manager. Meaning each girl paid 25/3 = 8.3333333.

1 dollar was refunded to each. That makes 9.33333 that each paid. 9.33333333 * 3 = 27.999999 ~ 28. And the Oh So considerate and thotful thief of a waiter/porter/wateva has the remaining 2 dollars. 28+2=30

Q.E.D