Here's a Brain stumper, my 7th grade Algebra teacher told us.Bob, Ted, Larry check into a Motel, the desk clerk said it was $30, they each paid $10 and went to their room. The desk clerk then realized he had over charged them $5. He sent the Bellboy with 5 one dollar bills to take up to their room. The three guys were glad and tipped the Bellboy $2, so each person paid $9. If each person paid $9 and they gave the bellman $2, then 9x3 =$27 plus the $2 tip = $29 total, where is the missing dollar?