This question already has an answer here:
Here's a puzzle I just heard and while I know that this reasoning is fundamentally wrong, I can't explain why:
- Three people bought a dish for, say, 25\$ and paid 30\$
- The waiter didn't want to divide 5 by 3, so he took 2\$ for himself and gave 1$ to each of the clients
- Each of them seems to have spent 9\$, but 9\$ x 3 = 27\$, not 28. What happened to this one dollar?