Brain Puzzles

C# programming skills? Test them!

Sandeep — Tue, 07 Jul 2009 04:13:06 +0000

int main()
{
      int i, n = 20;
      for (i = 0; i < n; i–)
           printf(“*”);
      return 0;
}
Change OR add only one character and print ‘*’ exactly 20 times.
There are atleast 3 solutions to this problem

Three light bulbs and three switches. Identify each switch with its bulb!

Sandeep — Fri, 12 Jun 2009 11:16:17 +0000

There is a room with a door (closed) and three light bulbs (initially switched off). Outside the room there are three switches, connected to the bulbs. You may manipulate the switches as you wish, but once you open the door you can’t change them. Identify each switch with its bulb.

Switches : S1,S2 and S3
Bulbs : B1, B2 and B3

Will the level of water increase if you throw suitcase?

Sandeep — Fri, 12 Jun 2009 10:31:34 +0000

If you are on a boat and you throw out a suitcase, Will the level of water increase?

Guess the correct answer!

Sandeep — Fri, 12 Jun 2009 09:30:57 +0000

Here are three answers:

1. Answer A
2. Answer A or B
3. Answer B or C

There is only one correct answer to this question. Which answer is it?

Women shoots her husband!

Sandeep — Tue, 09 Jun 2009 09:18:22 +0000

A woman shoots her husband. Then she holds him under water for over 5 minutes. Finally, she hangs him. But 5 minutes later they both go out together and enjoy a wonderful dinner together. How can this be?

Which is bettter lion, assassin or fire?

Sandeep — Tue, 09 Jun 2009 09:16:31 +0000

A murderer is condemned to death. He has to choose between three rooms. The first is full of raging fires, the second is full of assassins with loaded guns, and the third is full of lions that haven’t eaten in 3 years. Which room is safest for him?

The river crossing puzzle

Sandeep — Tue, 09 Jun 2009 05:24:30 +0000

Five men and five boys have to cross the Ganga River to attend a birthday party. They have only one row boat with them. Because of the small size of the row boat, the boat can not carry more than one man, or more than two boys. Thus, a man riding with a boy would not be possible. What would be the least number of boat trips that would take everyone to the other shore?

The Halloween Party

Sandeep — Tue, 09 Jun 2009 05:01:47 +0000

Mrs. Green, Mrs. Brown, and Mrs. Blue attended a Halloween Party. They came wearing green, brown, and blue costumes but not necessarily in their respective order. Mrs. Green said to the lady wearing the brown costume, “Did you notice that the three of us are wearing costumes having colors not corresponding to our names?”

Determine which colored costume each of them wore during the Halloween Party.

The Three Knights

Sandeep — Tue, 09 Jun 2009 03:44:45 +0000

During the age of the medieval empires, when knights and barbarians fought against each others, a man was captured and sentenced to death for allegedly befriending barbarians. The king, however, wanted to give him another chance. The king ordered him to his presence and ask him to choose one of the three knights present. One of the knights is the Knight of Life, and he always tells the truth. The second Knight is the Knight of Death, and he always tells lies. The third knight is the Knight of the Dungeon. He sometimes lies and sometimes tells the truth. If the man chooses the Knight of Death, he is to be executed before sunset. If he chooses the Knight of Life, he would be acquitted and set free right away. If he chooses the Knight of the Dungeon, he would spend the rest of his life imprisoned in the Dungeon. This is the first time the man ever saw these knights and could not recognize them. However, the man is allowed to ask these three knights one question each. Thus, the man asked the red hair knight, “What is the name of this blond hair knight?” The reply was “He is the Knight of the Life.” He asked the black hair knight, “What is the name of this blond hair knight?” The reply was “He is the Knight of Death.” Then he asked the blond hair knight “Who are you?” “I am the Knight of the Dungeon” was the reply. Luckily, the man was able to correctly choose the Knight of Life, and was set free immediately. Can you identify who was the Knight of Life, and also who the other two knights were?

Will the Sun shine?

Sandeep — Tue, 09 Jun 2009 03:27:56 +0000

It is noon, your lunch hour, but you cannot go out because there is a terrific hailstorm. Turning on your radio you hear the weather caster predict that the hail will change to rain and that it will pour all day today. How can you determine whether the sun will be shining in 36 hours?

100 Programmers and an assassin

Sandeep — Mon, 08 Jun 2009 07:50:38 +0000

100 C# programmers are lined up in a row by an assassin. The assassin puts red and blue hats on them. They can’t see their own hats, but they can see the hats of the people in front of them. The assassin starts in the back and says “what color is your hat?” the C# programmer can only answer “red” or “blue.” The programmer is killed if he gives the wrong answer; then the assassin moves on to the next programmer. The programmers in front get to hear the answers of the programmers behind them, but not whether they live or die. They can consult and agree on a strategy before being lined up, but after being lined up and having the hats put on, they can’t communicate in any way other than those already specified. What strategy should they choose to maximize the number of programmers who are guaranteed to be saved?

4 women who want to cross a bridge

Sandeep — Mon, 08 Jun 2009 05:34:30 +0000

There are 4 women who want to cross a bridge. They all begin on the same side. You have 17 minutes to get all of them across to the other side. It is night. There is one flashlight. A maximum of two people can cross at one time. Any party who crosses, either 1 or 2 people, must have the flashlight with them. The flashlight must be walked back and forth, it cannot be thrown, etc. Each woman walks at a different speed. A pair must walk together at the rate of the slower woman’s pace.
Woman 1: 1 minute to cross
Woman 2: 2 minutes to cross
Woman 3: 5 minutes to cross
Woman 4: 10 minutes to cross

For example if Woman 1 and Woman 4 walk across first, 10 minutes have elapsed when they get to the other side of the bridge. If Woman 4 then returns with the flashlight, a total of 20 minutes have passed and you have failed the mission. What is the order required to get all women across in 17 minutes? Now, what’s the other way?

Show Answer

The Most Intelligent Prince

Sandeep — Mon, 08 Jun 2009 05:09:33 +0000

A king wants his daughter to marry the smartest of 3 extremely intelligent young princes, and so the king’s wise men devised an intelligence test.

The princes are gathered into a room and seated, facing one another, and are shown 2 black hats and 3 white hats. They are blindfolded, and 1 hat is placed on each of their heads, with the remaining hats hidden in a different room.

The king tells them that the first prince to deduce the color of his hat without removing it or looking at it will marry his daughter. A wrong guess will mean death. The blindfolds are then removed.

You are one of the princes. You see 2 white hats on the other prince’s heads. After some time you realize that the other prince’s are unable to deduce the color of their hat, or are unwilling to guess. What color is your hat?

Note: You know that your competitors are very intelligent and want nothing more than to marry the princess. You also know that the king is a man of his word, and he has said that the test is a fair test of intelligence and bravery.

Show Answer

The Brain Puzzles Site!

Sandeep — Mon, 08 Jun 2009 04:00:36 +0000

Welcome to Brain Puzzles!
I have started this site for giving and solving puzzles. Puzzles are very helpful in increasing the analytical ability of a person. So lets gear up and try to solve as much puzzles as possible