Critical Thinking Puzzles

101 Hotel Rooms

2012-01-07T15:19:00.000+05:30

The Hilton Hotel reserves all its 101 rooms for travelers and each
guest is assigned a room in advance. The first guest arrives but
has forgotten his room number. The hotel clerk, who does not have
access to the reservations book, randomly puts him in one of
the rooms. As the rest of the guests arrive they are given their
reserved room if available or if already taken, are given a random
empty room. What is the chance that the 101st guest gets
her reserved room?

If 7 - 3 = 10124 ...

2012-01-01T19:04:00.000+05:30

If
7 - 3 = 10124
6 + 3 = 3279
5 – 2 = 763
11 + 2 = 92613

Then,
15 - 3 =?

Tweleve statements Puzzle

2011-12-17T16:48:00.001+05:30

Which of the statements in the box are true?

Ant on a Cube

2011-11-08T07:30:00.001+05:30

An ant is placed at one corner of a wire frame in the shape
of a cube. At the diagonally opposite corner is a piece of sugar.
The ant crawls along the all the wires of the frame searching for
the sugar. At each of the 8 corners the ant randomly chooses one of
the 3 wires to follow next (including the one it just traveled)

What is the expected number of edges the Ant will traverse until it
reaches the sugar?

What if the Ant never doubles back on the wire it just crossed?

How many people are there?

2011-11-04T19:10:00.000+05:30

How many people must be there if all but 2 are named Smith, all but 2 are named Jones, and all but 2 are named Wilson?

The wine bottle puzzle

2011-10-23T22:30:00.003+05:30

I have two 10 litre bottles full of wine and 2 other empty
bottles of 5 and 4 litres. I want to fill 3 litres in each
empty bottles without the help of any additional object and without
pouring out or wasting a single drop of wine.

Fake Note Puzzle

2011-10-01T16:52:00.001+05:30

Ram and Mohan are friends, having their own shop, side by side.
Once Shyam came to Ram's shop, asked for a water bottle, that
costs 20Rs. Shyam gave 100 Rs. note, but Ram didnt have change.
Ram gave the same 100Rs. note to Mohan and took cange from
him. Ram kept 20Rs from that change an return remaining amount
and a water bottle to Shyam.
Next day Mohan complained to Ram that the 100Rs. note gave him
and took change was fake note, then Ram gave him a real 100Rs.
note and take the fake 100Rs. note back.

what is the total loss to Ram in the whole transaction.
{profit/loss on water bottle neglected}

What is the speed of the car ?

2011-09-16T16:12:00.000+05:30

A person drives with constant speed and after some time he sees a
milestone with 2 digits. Then travels for 1 hour and sees the same 2
digits in reverse order. 1 hour later he sees that the milestone
has the same 2 digits with a 0 between them. What is the speed of
the car?

Rope Puzzle - Rajeev is trapped !!!

2011-08-27T23:57:00.001+05:30

Rajeev is trapped atop a building 200m high. He has with him a rope
150m long. There is a hook at the top where he stands. Looking
down, he notices that midway between him and the ground,at a
height of 100m, there is a ledge with another hook. In his pocket
lies a Swiss knife.

How might he be able to come down using the rope, the two hooks
and the Swiss knife?

A revolver with 2 bullets

2011-08-11T11:13:00.000+05:30

You have been taken hostage by terrorists. Terrorist has a revolver with 6 empty chambers. He now loads the revolver with 2 bullets in front of you. These two bullets are kept next to each other (contiguously) in the 2 adjacent chambers, the terrorist now spins the barrel so that now you don't know what is location of bullets in chamber. He keep the revolver against your head and pulls the trigger. But its lucky day for you. It was the empty chamber. Now terrorist gives a slight chance to get free. He gives you a choice whether he should spin the barrel first then pull the trigger again.. or should just simply pull the trigger again ? If you get lucky again, terrorists will let you go..otherwise ..!!!

So what would you prefer ? Would you want him to spin the barrel first then shoot or just shoot without spinning the barrel ?

Inverted Cards

2011-08-06T13:54:00.000+05:30

A blind man was handed a deck of 52 cards with exactly 10 cards
facing up. How can he divide it into two piles, each of which
having the same number of cards facing up?

The Hidden Tiger Puzzle

2011-07-13T00:04:00.000+05:30

The image shows a huge Bengal Tiger standing in a bamboo forest.
Your mission is to look for "The Hidden Tiger" in the image below.

Painted Cubes

2011-06-19T18:52:00.000+05:30

Twenty seven identical white cubes are assembled into a single cube,
the outside of which is painted black. The cube is then disassembled
and the smaller cubes are thoroughly shuffled in a bag.

A blindfolded man (who cannot feel the paint) reassembles the pieces
into a cube. What is the probability that the outside of this cube is
completely black?

How many squares are there on a rubik's cube ?

2011-05-22T14:12:00.000+05:30

Find out how many squares & rectangles can be formed on the sides
of a solved 3X3 Rubik's cube ?

Note: A square can be considered as a rectangle

Answer of 6÷2(1+2) is ...

2011-04-30T22:30:00.000+05:30

Here is a simple maths for you..

whats the answer of 6÷2(1+2) = ?

A pack of playing cards

2011-04-10T20:08:00.000+05:30

If a pack of playing cards measures 1.3cm when viewed sideways,
what would be the measurement if all the aces were removed?

A Confused Blood Relation

2011-04-05T00:45:00.002+05:30

Pointing to a girl in the photograph, Amar said,

" Her Mother's brother is the only son of my mother' s father "

How is the Girl's mother related to Amar?

Sally and Wally

2011-03-30T00:32:00.001+05:30

Sally goes to Wallys house during vacations. They play a chess game everyday and the loser has to give a chocolate to the winner for every game. Sally gave 8 chocolates at the end of the vacations, although she had won 12 games. How long did she stay there?

A Fly In Between Trains Problem

2011-03-21T11:11:00.004+05:30

Two trains are traveling toward each other on the same track, each at 60 miles per hour. When they are exactly 120 miles apart, a fly takes off from the front of one of the trains, flying toward the other train at a constant rate of 100 miles per hour. When the fly reaches the other train, it instantly changes directions and starts flying toward the other train, still at 100 miles per hour. It keeps doing this back and forth until the trains finally collide.

If you add up all the distances back and forth that the fly has travelled, how much total distance has the fly travelled when the trains finally collide?

A boy at the Carnival

2011-03-02T08:39:00.003+05:30

A boy was at a carnival and went to a booth where a man said to
the boy, "If I write your exact weight on this piece of paper
then you have to give me $50, but if I cannot, I will pay you $50."

The boy looked around and saw no scale so he agrees, thinking no
matter what the carny writes he'll just say he weighs more or less.
In the end the boy ended up paying the man $50.

How did the man win the bet?

Two Daughters, Three Questions

2011-02-26T23:10:00.002+05:30

1. A couple has two children, what are the odds they are both girls?

2. Given that one of their two children is a girl, what are the odds
the other child is a girl?

3. Given that one is a girl named "Flo", what are the odds the other is
a girl?

100 Meter race

2011-02-20T18:53:00.000+05:30

Andy, Barry, and Carl race each other in a 100-meter dash.
They each run at a constant speed throughout the sprint.
Andy beats Barry by 20 meters, and Barry beats Carl by 20 meters.
How many meters does Andy beat Carl by?

Solve the murder mystery

2011-02-14T23:58:00.003+05:30

A man was found murdered on Sunday morning. His wife
immediately called the police. The police questioned the
wife and staff and got their alibis:

The Wife said she was sleeping.
The Cook was cooking breakfast.
The Gardener was picking vegetables.
The Maid was getting the mail.
The Butler was cleaning the closet.

The police instantly arrested the murdered.
Who did it and how did they know?

The loser wins !!

2011-02-09T07:24:00.005+05:30

A sheik announced that a race would decide which of his two sons
would inherit all his wealth. The sons were to ride their camels
to a certain distant city. The son whose camel reached the city
last would be given all the sheik's wealth.

The two sons set out on the journey. After several days of
aimless wandering, they met and agreed to seek the advice of
a wise man. After listening to the wise man's advice, the two sons
rode the camels as quickly as possible to the designated city.

What was it that the wise man told the two sons? They did not
agree to split the wealth, and their father's decree would
be followed.

IQ puzzle

2011-01-26T15:35:00.003+05:30

Find a number such that when you rotate the number to the left,
the new number is 1.5 times the original number.

To rotate the number left, move the first digit to the last place
of the number like 75837 rotated to the left is 58377)