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Logical Thinking Puzzles With Answers

Logical Thinking Puzzles With Answers 1 : Difficult Brain Twister
Difficulty ★★★★★        Popularity ★★★★☆


There are 100 bulbs in a room. 100 strangers have been accumulated in the adjacent room. The first one goes and lights up every bulb. The second one goes and switches off all the even numbered bulbs – second, fourth, sixth... and so on. The third one goes and reverses the current position of every third bulb (third, sixth, ninth… and so on.) i.e. if the bulb is lit, he switches it off and if the bulb is off, he switches it on. All the 100 strangers progresses in the similar fashion.

After the last person has done what he wanted, which bulbs will be lit and which ones will be switched off ?
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Logical Thinking Puzzles With Answers 2 : Tricky Math Logic Problem
Difficulty ★★★★☆        Popularity ★★★★☆


A girl was fond of collecting rare stamps. When she was twenty years old, she bought a box to collect her stamps. On her every birthday, she put 250 stamps in it and her sister who was also fond of collecting stamps took out 50 stamps from it on her birthday. The girl met an accident when she was 60 years old. When her box was opened, there were only 500 stamps in it.

How is it possible logically?
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Logical Thinking Puzzles With Answers 3 : Frog In The Well Riddle
Difficulty ★★★☆☆        Popularity ★★★★★


A frog fell on a bottom of the well.
The well is 30 feet deep.

During day time, the frog jumps 5feet while at night when the frog sleeps he slip back 4feet.

In how many days frog will come out from the well ?
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Logical Thinking Puzzles With Answers 4 : Tricky Murder Mystery Logical Riddle
Difficulty ★★☆☆☆        Popularity ★★★★★


Four boys were playing a game in which they need to throw the stone in the water so that the stone at don't get sunk into the water(there is some solid area in water).
Boy1: Succeeded in throwing 2 stones at solid area but 1 of the stone sunk.
Boy3: All stones got sunk.
Boy4: None of the stones got sunk.

Boy2 was the winner but was struck by a stone in the head and died.

Who killed Boy2 ?
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Logical Thinking Puzzles With Answers 5 : Infosys Trick Interview Riddle
Difficulty ★★★☆☆        Popularity ★★★★☆


Bruce Banner was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?
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Logical Thinking Puzzles With Answers 6 : Smart Trick Teaser
Difficulty ★★★☆☆        Popularity ★★★★☆


While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds.

How ?
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Logical Thinking Puzzles With Answers 7 : Gold Box Puzzle
Difficulty ★★☆☆☆        Popularity ★★★☆☆


There are three boxes in a table. One of the box contains Gold and the other two are empty. A printed message contains in each box. One of the message is true and the other two are lies.
The first box says 'The Gold is not here'.
The Second box says 'The Gold is not here'.
The Third box says 'The Gold is in the Second box'.
Which box has the Gold?
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Logical Thinking Puzzles With Answers 8 : Question Riddle
Difficulty ★★☆☆☆        Popularity ★★★☆☆


If in a cycle race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?
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Logical Thinking Puzzles With Answers 9 : Truth Or Lie Puzzle
Difficulty ★★☆☆☆        Popularity ★★★☆☆


Out of three people (Lavesh, Mayank and Manoj), one of them is a king, one a bureaucrat, and one a thief.

The king always tells the truth, the bureaucrat always lies, and the thief can either lie or tell the truth.

Lavesh says: 'Manoj is a bureaucrat.'
Mayank says: 'Lavesh is a king.'
Manoj says: 'I am the thief.'

Who is the king, who the bureaucrat, and who the thief?
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Logical Thinking Puzzles With Answers 10 : Fireman The Murderer Riddle
Difficulty ★★☆☆☆        Popularity ★★★☆☆


Acting on an anonymous phone call, the police raid a house to arrest a suspected murderer. They don't know what he looks like but they know his name is John and that he is inside the house. The police bust in on a carpenter, a lorry driver, a mechanic and a fireman all playing poker. Without hesitation or communication of any kind, they immediately arrest the fireman. How do they know they've got their man?
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