This section contains large collection of interview puzzles and their answers with clear description from real interviews. You may check the puzzle blog to post new puzzles and answers.

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Duplicate Lottery Picks: In the Massachusetts Megabucks lottery, six different numbers from 1 to 42 (inclusive) are selected...

Another Game of Dice : Your friend offers to play a game of dice with you. He explains the game to...

The Flawed Game: A teacher was having trouble getting her students to learn their facts, but she noticed that her students...

5
houses in 5 colors: This puzzle was apparently written
by Einstein in the last century. He said that 98% of the people in the world...

5 Jars of
pills: You have 5 jars of pills. Each pill weighs 10
grams..

One gold bar: You have someone working for you for seven days
and you have one gold bar to pay...

Life or Death? The Emperor's Proposition: you are a prisoner sentenced to death. The Emperor offers you...

Birthday Line: At a movie theater, the manager announces that they will give a free
ticket...

Russian Roulette: You are in a game of Russian Roulette with a revolver that has 3...

Teddy Bears Puzzle: he game starts when I give you some bears. You can then give back some
bears...

Who is taller: 500 men are
arranged in an array of 10 rows and 50 columns according to their heights...

There are four people
who want to cross a bridge; theyall
begin on the same side. You have 17 minutes to get them all across tothe other side. It is night, and they
have one flashlight. A maximum of twopeople
can cross the bridge at one time. Any party that crosses, either one or
two people, must have the flashlight with them. The flashlight must bewalked back and forth; it cannot be
thrown, for example.Person 1 takes1
minute to cross the bridge, person 2 takes 2 minutes, person 3 takes 5
minutes, and person 4 takes 10 minutes.
A pair must walk together at therate
of the slower personâ€™s pace. For example, if person 1 and person 4walk across first, 10 minutes have
elapsed when they get to the other sideof
the bridge. If person 4 returns the flashlight, a total of 20 minutes
havepassed and you have failed
the mission.

-------------------------------------------------------------------------------------------------------------------------------------------------- A
census taker approaches a house and asks the woman who answers the door
"How many children do you have, and what are their ages?"

Woman:
"I have three children; the product of their ages is 36, the sum
of their ages is equal to the address of the house next door."

The census taker walks next door, comes back and says "I need more information."

The woman replies "I have to go; my oldest child is sleeping upstairs."

Census taker: "Thank you, I now have everything I need."

You have 12 balls identical in size and appearance but one is an odd weight (it could be either light or heavy).

You
have a set of scales which will give three possible
readings: Left = Right, Left > Right or Left < Right (I.E Left
and Right have equal weight, Left is Heavier, or Left is Lighter).

You
have only three chances to weigh the balls in any combination
using the scales. Determine which ball is the odd one and if it's
heavier or lighter than the rest. How do you do it?

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You
are in the dark, and on the floor there are six shoes of three colors,
and a heap of twenty-four socks, black and brown. How many socks and
shoes must you take into the light to be certain that you have a
matching pair of socks and a matching pair of shoes?

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There
are three playing cards lying face up, side by side. A five is just to
the right of a two. A five is just to the left of a two. A spade is
just to the left of a club, and a spade is just to the right of a
spade. What are the three cards?

What
is the four-digit number in which the first digit is one-third the
second, the third is the sum of the first and second, and the last is
three times the second?

One
train runs from A to B at 105 miles per hour; the other runs from B to
A at 85 miles per hour. How far apart were the two trains 30 minutes
prior to their crossing?

The
following verse spells out a word, letter by letter. "My first" refers
to the word's first letter, and so on. What's the word that this verse
describes? My first is in fish but not in snail My second in rabbit but not in tail My third in up but not down My fourth in tiara not in crown My fifth in tree you plainly see My whole a food for you and me

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Bill,
Ken, and Mark are, not necessarily in this order, a quarterback, a
receiver, and a kicker. The kicker, who is the shortest of the three,
is a bachelor. Bill, who is Ken's father-in-law, is taller than the
receiver.

Given
twelve marbles, identical in size, shape and color, which single marble
is heavier in weight than the others? You are supplied with a balance
and must conclude your determination using the balance three
times only.