I heard this when I was a kid and came across it again.
Three people go to a hotel together, it cost $30 for a room, they each pay $10. Later on the clerk tells the bellboy that there's a sale and it's only $25, so the clerk gives the bellboy $5 to bring up to the room, since he can't split it up three ways he decides to keep $2 and give back $3. So each person ends up paying $9, which equals $27. What happened to the other doller?
Three people go to a hotel together, it cost $30 for a room, they each pay $10. Later on the clerk tells the bellboy that there's a sale and it's only $25, so the clerk gives the bellboy $5 to bring up to the room, since he can't split it up three ways he decides to keep $2 and give back $3. So each person ends up paying $9, which equals $27. What happened to the other doller?