system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: The Missing Dollar Riddle.

Three people check into a hotel room. The clerk says the bill is $30, so each guest pays $10. Later the clerk realizes the bill should only be $25. To rectify this, he gives the bellhop $5 to return to the guests. On the way to the room, the bellhop realizes that he cannot divide the money equally. As the guests didn't know the total of the revised bill, the bellhop decides to just give each guest $1 and keep $2 as a tip for himself. Each guest got $1 back: so now each guest only paid $9; bringing the total paid to $27. The bellhop has $2. And $27 + $2 = $29 so, if the guests originally handed over $30, what happened to the remaining $1?
gpt
The $27 paid includes the $2 tip, so adding them makes no sense but the riddle confuses you into thinking that it does. The original $30 is made up of the $27 paid ($25 to the hotel plus $2 tip) and the $1 each they got back.