Since you all are poo-poo heads who think you’re so smart and can answer setz’s math problem before me, here’s a conundrum for you. I’ll even explain the rule used in each step so you can see for yourselves that I’m not breaking any rules.

Thanks, Mr. I look up answers to riddles and then tell them to everyone and spoil the whole thing or else I already knew the answer and spoiled it for everyone anyway. AKA Kraken. =(

ON the other hand, if I ever get REALLY bored, I can post an airtight mathematical proof that the human race doesn’t exist, based on the limit property of calculus and simple probability.

Three guys went to a bar, and at the end of their drinking, the bill was $27 ($9 / person). They gave three $10 bills to the waiter, who, for lack of smaller money, returned them a $5 bill. The guys then gave a $2 bill back to the waiter as a tip, so that each of them still kept his proper $1 change.

Now, they paid $27, plus the $2 tip to the waiter, for a total of $29. Where’s the last $1?

Redcomet was right. The trio gave the waiter $30, received $5 back, then gave him $2 “as a tip” – except that 30 - 5 + 2 = 27, which was the cost of the drinks to begin with. In other words, they paid the full $27 and included no tip. The riddle is entirely linguistic: it works because you unwittingly accept “as a tip,” which trips you up later.