Puzzles


A man is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the…


You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.

Ans:You give an apple each to your first nine friends, and a…


Two fathers took their sons fishing.
Each man and son caught one fish, but when they returned to camp there were only 3 fish. How could this be?
(None of the fish were eaten, lost, or thrown back.)
Ans: There were only three people. The son, his father, and his grandfather.


You can paddle your canoe seven miles per hour through any placid lake. The stream flows at three miles per hour. The moment you start to paddle up stream a fisherman looses one of his bobbers in the water fourteen miles up stream of you.
How many hours does it take for you and the bobber…

A frog is at the bottom of a 30 meter well. Each day he summons enough energy for one 3 meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

Note: Assume after the first leap that his hind legs are exactly three meters up the well.

You work at a fruit factory.
There are 3 crates in front of you. One crate contains only apples. One crate contains only oranges. The other crate contains both apples and oranges.
And each crate is labeled. One reads "apples", one reads "oranges", and one reads "apples and oranges".
But the labeling machine has gone crazy and is now labeling all boxes…

In your bedroom, you have a drawer with 2 red, 4 yellow, 6 purple, 8 brown, 10 white, 12 green, 14 black, 16 blue, 18 grey, and 20 orange socks. It is dark in your bedroom, so you cannot distinguish between the colors of the socks.
How many socks do you need to take out of the drawer to be sure that you have at least three pairs of socks of the same color?

A
 light bulb is hanging in a room. Outside of the room, there are three switches, of which only one is connected to the lamp. In the starting situation, all switches are 'off' and the bulb is not lit.
If it is allowed to check in the room only once to see if the bulb is lit or not (this…

Jack and his wife went to a party where four other married couples were present. Every person shook hands with everyone he or she was not acquainted with. When the handshaking was over, Jack asked everyone, including his own wife, how many hands they shook. To his surprise, Jack got nine different…

T
om has three boxes with fruits in his barn: one box with apples, one box with pears, and one box with both apples and pears. The boxes have labels that describe the contents, but none of these labels is on the right box.
How can Tom determine what each of the boxes contains, by taking…

Y
ou are standing next to a well, and you have two jugs. One jug has a content of 3 liters and the other one has a content of 5 liters.
How can you get just 4 liters of water using only these two jugs?
Ans 1 :
F
ill the 5-liter jug. Then fill the 3-liter jug to the top with water from…

I
n the middle of a round pool lies a beautiful water lily. The water lily doubles in size every day. After exactly 20 days, the lily will cover the complete pool.
After how many days will the water lily cover half of the pool?
Ans:
B
ecause the water lily doubles its size every day and…