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L&T Infotech Interview Puzzle #1 - Tricky Time Measure Puzzle

Difficulty Popularity

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

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L&T Infotech Interview Puzzle #2 - Famous Egg Floor Riddle

Difficulty Popularity

* You are given 2 eggs.
* You have access to a 100-story building.
* Eggs can be very hard or very fragile means it may break if dropped from the first floor or may not even break if dropped from 100th floor.Both eggs are identical.
* You need to figure out the highest floor of a 100-story building an egg can be dropped without breaking.
* Now the question is how many drops you need to make. You are allowed to break 2 eggs in the process

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L&T Infotech Interview Puzzle #3 - Famous Probability Puzzle

Difficulty Popularity

This is a famous probability puzzle in which you have to choose the correct answer at random from the four options below.
Can you tell us whats the probability of choosing correct answer in this random manner.

1) 1/4
2) 1/2
3) 1
4) 1/4

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L&T Infotech Interview Puzzle #4 - Crossing The River In Minimum Time Puzzle

Difficulty Popularity

Four people need to cross a dark river at night.

* They have only one torch and the river is too risky to cross without the torch.
* If all people cross simultaneously then torch light wont be sufficient.
* Speed of each person of crossing the river is different.cross time for each person is 1 min, 2 minutes, 7 minutes and 10 minutes.

What is the shortest time needed for all four of them to cross the river ?

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L&T Infotech Interview Puzzle #5 - Water Gallon Brain Teaser

Difficulty Popularity

This is a logical test and if you can do it then you have a better logical mind than half of the population.
There are two measuring baskets: one has the capacity of 5 gallons and the other has the capacity of 3 gallons. If you are given with unlimited supply of any liquid, how will you measure 4 gallons of that liquid in the least moves?

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L&T Infotech Interview Puzzle #6 - Interesting Coin Probability Puzzle

Difficulty Popularity

A man tosses three coins in the air. When they land, he finds that two of the coins have heads up and one has tails up.

What is the probability that when the coins are tossed again, they will land again with two heads up and one tails up.

Please note that the coins are unbiased.

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L&T Infotech Interview Puzzle #7 - Critical Thinking Interview Question

Difficulty Popularity

If three friends want to know the average of their salaries, how can they know it without disclosing their actually salary to the other ones?

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L&T Infotech Interview Puzzle #8 - Popular Deductive Logic Problem

Difficulty Popularity

Eight Brothers lives in an old house where there is no electricity and no computers or any any other gadget.

Brother-1: Reading Comics
Brother-2: Playing Chess
Brother-3: Writing
Brother-4: making food for the family
Brother-5: sleeping and snoring
Brother-6: cleaning house
Brother-7: watering the plants


what is Brother-8 doing ?

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L&T Infotech Interview Puzzle #9 - Interview Marble Logic Puzzle

Difficulty Popularity

You are given a set of scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to conclude either that the contents of the dishes weigh the same or that the dish that falls lower has heavier contents than the other.
The 12 marbles appear to be identical. In fact, 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more.

Note that the unusual marble may be heavier or lighter than the others. You are asked to both identify it and determine whether it is heavy or light.

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L&T Infotech Interview Puzzle #10 - IES Interview Riddle

Difficulty Popularity

How many times do a clock's hands overlap in a day ?

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