Bulbs Brain Teaser
Imagine you are in a room with 3 switches. In the adjacent room there are 3 bulbs (all are off at the moment), each switch belongs to one particular bulb. It is impossible to see from one room to another. How can you find out, which switch belongs to which bulb, if you can only enter the room with bulbs once?

Ball in a Hole Brain Teaser
A table tennis ball fell into a tight deep pipe which cannot be moved. The pipe was only a bit wider then the ball, so you can not use your hand. How would you take it out, with no damage?

Water Brain Teasers

1. If you had a 5-litre and a 3-litre bowl and access to water. How would you measure exactly 4 litres?

2. How can you measure 6 litres of water using only 4 and 9-litre bowls?

3. Imagine having three bowls. In bowl A (8 litres capacity) there are 5 litres of water. In bowl B (5 litres capacity) there are 3 litres of water. In bowl C (3 litres capacity) there are 2 litres of water.
Can you measure exactly 1 litre, overspilling only 2 times?

Weighing Brain Teasers

Imagine you have 10 bags full of coins, in each bag 1000 coins. In one bag, there are all coin forgeries. The original coin is 1 gram light, forgery is 1.1 gram. Balancing just once on an accurate weighing-machine, how can you identify the bag with forgeries?

On a Christmas tree there are two blue, two red and two white balls. All seem the same, however in each color pair one ball is heavier. All three lighter balls are the same weight, just like all three heavier balls. Using a pair of scales twice, identify the lighter balls.

Weird Money Brain Teaser
I have two US coins totaling 55 cents. One is not a nickel. What are the coins?

Speeding Up Brain Teaser
If I go half a way to the town at the speed of 30 km/hour, how fast do I have to go for the rest of the way to have the average speed of the entire way 60 km/hour?

Midnight Brain Teaser
If it were two hours later, it would be half as long until midnight as it would be if it were an hour later. What time is it now?

Car In The Dessert Brain Teaser
A military car carrying an important letter must cross a desert. There is no gas station in the desert and the car has space only for gas that lasts to the middle of the desert. There are also other cars that can transfer their gas into one another.
How can the letter be delivered?

Apples Brain Teaser
A basket contains 5 apples. Do you know how to divide them to 5 kids so that each one has an apple and one apple stays in the basket?

Babies Brain Teaser
Two girls are born to the same mother, on the same day, at the same time, in the same year and yet they're not twins. How can this be?

Albert Einstein Brain Teaser
This quiz was made up by Albert Einstein and according to him 98% will not solve it.
There is a row of five houses, each having a different colour. In these houses live five people of various nationalities. Each of them nurtures a different beast, likes different drinks and smokes different brand of cigars.

1. The Brit lives in the Red house.
2. The Swede keeps dogs as pets.
3. The Dane drinks tea.
4. The Green house is on the left of the White house.
5. The owner of the Green house drinks coffee.
6. The person who smokes Pall Mall rears birds.
7. The owner of the Yellow house smokes Dunhill.
8. The man living in the centre house drinks milk.
9. The Norwegian lives in the first house.
10. The man who smokes Blends lives next to the one who keeps cats.
11. The man who keeps horses lives next to the man who smokes Dunhill.
12. The man who smokes Blue Master drinks beer.
13. The German smokes Prince.
14. The Norwegian lives next to the Blue house.
15. The man who smokes Blends has a neighbour who drinks water.

Who has fish at home? (are you one of the 2% ?).

Brain teasers solutions