1. A gambler is holding 3 coins. One is an ordinary quarter, the second has 2 heads, and the third has 2 tails. The gambler chooses one of the coins at random and flips it, showing heads. What is the likelihood that the other side is tails?
2. As I was walking my dog to the market I met an elderly couple going in the opposite direction with their 3 sons and 3 daughters. Each son had 2 dogs of his own and each dog had 3 fleas. Each daughter had 2 cats and each cat had 2 fleas. In total, how many persons, animals and insects were going to the market?
3. My daughter has many sisters. She has as many sisters as she has brothers. Each of her brothers has twice as many sisters as brothers. How many sons and daughters do I have?
4. A plane crashed and every single person on board this flight was killed, yet...there we're survivors. Explain how?
5. How many 1 foot by 1 foot bricks would it take to complete a building that's 20 feet long on all four sides and 20 feet high?
6. A cop was walking past a restaurant when he heard someone scream, "No John, not the gun!" He ran inside and saw a doctor, a lawyer, a milkman, and a dead body on the floor. He promptly walked over to the milkman and arrested him. He didn't witness the shooting and there was no apparent evidence to prove who shot the person and no one told him who the killer was. How did the policeman instantly know it was the milkman?
7. What is so special about this sequence below?
8 5 4 9 1 7 6 10 3 2 0
8. A horse is tied to a five-meter rope, six meters away from it was a bail of hay. Without breaking the rope, the horse was able to get to the bail of hay. How is this possible?
9. Mary was making apricot jam. She put all the apricots in the pot and stirred them up. Then she remembered she had to add 1 ounce of lemon juice for every two apricots. How did she figure out how much lemon juice to put?
10. Steve and Sally where sitting in their family room one night. While Steve was watching TV; his wife Sally was reading. All of a sudden the power went out and Steve decided to go to bed, but Sally kept on reading. With no use of artificial light, Sally kept on reading. How?
1. One in three, since there're 3 heads, and only one of them has tails opposite.
2. Two. Just my dog and I.
3. 4 daughters, 3 sons.
4. There were married people on the flight… only "single” people died.
5. Only 1… the “last brick” you put in will complete it”
6. The milkman was the only male. The doctor and lawyer were females, so the cop knew that “John” was the milkman.
7. The numbers are in alphabetical order. (eight, five, four, nine, one, seven, six, ten, three, two, zero)
8. The other end of the rope is tied to nothing.
9. She counted the pits.
10. Sally was blind… she was reading a book by Braille.