• Views : 50k+
• Sol Viewed : 20k+

#1 - Two Eggs Interview Problem

Difficulty Popularity

Eggs have quite a unique property. They may be extremely fragile that they may break by mere a drop from your hand. However, they may not break even if they are dropped from the 100th floor. That is exactly what you have in this problem. You have two identical eggs and you have access to a 100 story building.

The question is how many drops you will make before you can find out the highest possible floor of the building from which the egg can be dropped without breaking. Remember you only have two eggs to break.

• Views : 50k+
• Sol Viewed : 20k+

#2 - Hard Yahoo Logical Mathematics Interview Question

Difficulty Popularity

In an old town, there lived a pot maker who wanted to sell the last stock of his craft to a merchant. When the merchant asked him how many pots he had, he replied that he was unable to count after 100. But he gave him certain clues to figure out for himself:

If the number of pots are divided by two, there will be one left.
If they are divided by three, there will be one left.
If they are divided by four, there will be one left.
If they are divided by five, there will be one left.
If they are divided by six, there will be one left.
If they are divided by seven, there will be one left.
If they are divided by eight, there will be one left.
If they are divided by nine, there will be one left.
If they are divided by ten, there will be one left.
But if they are divided by eleven, there will be no pot left.

Can you find the number of pots, the pot maker possess?

• Views : 50k+
• Sol Viewed : 20k+

#3 - Extremely Tough Series Interview Question

Difficulty Popularity

Find the next number in the series

3, 3, 5, 4, 4, __?

• Views : 40k+
• Sol Viewed : 10k+

#4 - Alien Invasion Interview Puzzle

Difficulty Popularity

An alien force has invaded the realms of the earth. All they plan is the destruction of the entire planet. However, they have given humans a chance. They picks up ten intelligent most humans (you are one of them) and take them in a pitch black room. There is nothing you can see in the total darkness. The aliens place a hat on every human. The hats are of two colors - pink and green. After they place all the hats, the lights are turned on.

You are not allowed to see your own hat. The circulation of the hat is totally random with any kind of possible combination. The aliens start from the back and ask, "What is the color of hat you are wearing?" Everyone is allowed to hear the answer. If he gives the correct answer, he will be allowed to live and save the people but if he gives the wrong answer, he will be killed mercilessly and the people you represent will be killed.

What will you do to save as many lives as you can?

• Views : 40k+
• Sol Viewed : 10k+

#5 - Logicians Interview Puzzle

Difficulty Popularity

Hundred most brilliant logicians are handpicked from the world and invited to a room. But before they could enter, they are told that at least one of them has a black forehead. Whenever anyone can frame out that he is having a black forehead, he needs to leave the room when the lights are turned off. After that, the lights are turned back on and those who could infer that their forehead was black have left the room.

What happens if they have painted every forehead black?

• Views : 40k+
• Sol Viewed : 10k+

#6 - Toughest Logician Interview Question

Difficulty Popularity

Three best logicians are brought into a room. Each of them has been painted a number on their forehead with a number that is unique and greater than zero. You are one of them and can see other two foreheads with the number 20 and 30 painted on them. The game begins and the host circles around the logicians asking each one of them to guess the number written on their forehead. Each of the logician is unable to answer and says that he can't guess it. Then the question is asked again.

What is your number and why?

• Views : 40k+
• Sol Viewed : 10k+

#7 - Prison Interview Puzzle

Difficulty Popularity

Once in a prison with 100 prisoners, the Warden introduces a strange but interesting challenge to all the prisoners. This challenge can even grant them the freedom and thus every one of the prisoners becomes quite excited.

The warden selects one prisoner everyday randomly from the lot and moves him into a pitch black room with a bulb and a witch that controls the bulb. The prisoner can carry out three different actions in the room - He can switch on the bulb, switch it off or do nothing and sit idle. A prisoner can be picked up more than one time.

Now the warden introduces the twist in the challenge. He tells them that the prisoners can put a stop to the process any day they feel that every one of them has been confined to that room at least once. If the prisoners are correct, then every single one of them will be set free. But if they have put up a wrong judgment, all of them will be killed.

Seeking it to be the only chance of freedom, the prisoners take up the challenge. They are given some time to discuss regarding it before the process could begin. How will they plan things so that they are finally set free?

• Views : 40k+
• Sol Viewed : 10k+

#8 - Warden and Prisoners Interview Question

Difficulty Popularity

23 selected prisoners are summoned by the warden. He gives them a choice of playing a game with him that might ensure their escape from the prison or might as well lead them towards painful death. The prisoners think that this is the only chance for them to be free again and agrees to him.

The warden tell them that there is a room which has just two switches which are labelled 1 or 2. The switches may be up or down and the condition is not known at present. They are not connected to anything. The warden may select any prisoner on any day and send him to the switch room. The prisoner will have to select any one switch and reverse its position i.e. if it is up, he will turn it down and if it is down, he will turn it up. He can and must only flip one switch and then he will be confined to his cell again.

The warden may choose the same prisoner more than one time and he will be choosing completely randomly. But at a certain point of time, everyone will have visited the switch room. And at any time, the prisoners may declare that everyone has visited the room at least once. If they will be true, they will be set free but if they will be wrong, they will be killed.

The warden gives them an hour to plan any kind of strategy and then they will be confined to their respective cells and will never be allowed to meet. What strategy can help them be free?

• Views : 40k+
• Sol Viewed : 10k+

#9 - Poisoned Wine Interview Puzzle

Difficulty Popularity

A King has a collection of 1000 bottles of irresistible and one of the finest wines in the world. The king is quite fond of drinking which is taken to be as a weak point by the neighboring king, He creates a plan to kill the king so that he can take over his kingdom and increase his power. He send in a servant to poison the wines with a deadly virus that is so strong that even if it is diluted a million times, it will still have an effect and will kill the king over a prolonged duration of one month.

The servant is able to mix poison in only one of the wines when the guards catch him. The servant is killed and thus the truth behind which of the 1000 bottles is poisoned dies with him. The king call up his advisor who is quite clever. He tells the king something which brightens up his face. He summons some of his prisoners. Seeking what the advisor told him, he knows that he will not have to murder more than ten prisoners and he will be able to enjoy the rest of the 999 bottles of wine after a month's time.

What trick did the advisor tell the king? How will the king be able to achieve what he thinks?

• Views : 40k+
• Sol Viewed : 10k+

#10 - Difficult Series Interview Question

Difficulty Popularity

In a series, if 1 and 2 produce 9, 3 and 4 produce 20 and 5 and 6 produce 12, what is the number after 17 and 12?

Submit your Email Address to get latest post directly to your inbox.

Latest Puzzles

25 October
4 Two's Biggest Number

What is the biggest number that can be f...

24 October
Count The Queue Riddle

Rohini is standing in a queue in which h...

23 October
Classic What Am I

I got many teeth, but I don't bite.Who A...

22 October
Frequent Maths Digit Brain Teaser

Can you identify the most common digit b...

21 October
Color Of Stairs Brain Teaser

I live in a one story house made up of r...

20 October
Make Equation True MatchStick Puzzle

Can you move one matchstick to make belo...

19 October
Murder Suspect Riddle

It was the first day of the college when...