3 weary guys check in to a motel one night. They each get a room, which the manager charges them $10.00 each for. After a bit, he decides that he over charged them, and the combined total for all 3 rooms should have only been $25.00. So he gives his helper 5 one dollar bills, and instructs him to pay it back to the three guys. So, away goes the helper on this errand. He thinks; well, I can't split 5 ones equally among 3 people. So he keeps 2 in his pocket, and gives each guy back $1.00. So, the rooms end up costing each guy $9.00 each, which times 3=$27.00. The helper kept $2.00. $27.00 + $2.00 = $29.00. Where did the other dollar go?