I've always enjoyed figuring out how to solve brain teasers and I've heard that your brain is like a muscle so if you keep it in shape (by teasing it I guess) it will serve you well throughout your life. Even if that's not true, I still like to solve them. If you know of any more good ones please send them to me. It can also be useful to know some of these if you are interviewing for a job somewhere. Lots of interviewers like to use these questions to ascertain how quickly you can think on your feet. If you don't understand the answer, you can email me and I'll explain it to you. Have fun :)

1. By moving one of the following digits, make the equation correct. 62 - 63 = 1
Solution : 26 - 63 = 1 (In other words, 2x2x2x2x2x2, which equals 64)
2. You have a fox, a chicken and a sack of grain. You must cross a river with only one of them at a time. If you leave the fox with the chicken he will eat it; if you leave the chicken with the grain he will eat it. How can you get all three across safely?
Solution : Take the chicken over first. Go back and bring the grain next, but instead of leaving the chicken with the grain, come back with the chicken. Leave the chicken on the first side and take the fox with you. Leave it on the other side with the grain. Finally, go back over and get the chicken and bring it over.
3. You have 12 black socks and 12 white socks mixed up in a drawer. It's early in the morning and you don't have any light to see the colors. How many socks must you pull out (blindly) to be sure of getting a matching pair?
Solution: 3 socks. If the first sock is black, the second one could be black, in which case you have a matching pair. If the second sock is white, the third sock will be either black and match the first sock, or white and match the second sock.
4. What is special about the following sequence of numbers? 8 5 4 9 1 7 6 10 3 2 0
Solution : The numbers are in alphabetical order: (eight, five, four, nine, one, seven, six, ten, three, two, zero)
5. Three travelers register at a hotel and are told that their rooms will cost $10 each so they pay $30. Later the clerk realizes that he made a mistake and should have only charged them $25. He gives a bellboy $5 to return to them but the bellboy is dishonest and gives them each only $1, keeping $2 for himself. So the men actually spent $27 and the bellboy kept $2 - what happened to the other dollar of the original $30?
Solution : Nothing. The 3 travelers paid a total of $27, making $25 for the hotel and $2 for the clerk. There is no missing $1.
6. You are the bus driver. At your first stop, you pick up 29 people. On your second stop, 18 of those 29 people get off, and at the same time 10 new passengers arrive. At your next stop, 3 of those 10 passengers get off, and 13 new passengers come on. On your fourth stop 4 of the remaining 10 passengers get off, 6 of those new 13 passengers get off as well, then 17 new passengers get on. What is the color of the bus driver's eyes?
Solution : The eye color of the reader of this problem. The first sentence is the key: “You are the bus driver”
7. A rooster lays an egg at the very top of a slanted roof. Which side is the egg going to roll off on?
Solution: Neither, roosters don't lay eggs.
8. An 18-wheeler is crossing a 4 kilometer bridge that can only support 10,000 kilograms and that's exactly how much the rig weighs. Halfway across the bridge a 30 gram sparrow lands on the cab, but the bridge doesn't collapse. Why not?
Solution: Since the bridge is 4 kilometers long, the halfway point would be 2 kilometers. The 18-wheeler would have used much more than 30g of fuel to drive 2 kilometers.