Critical Thinking Puzzles

eldhosebaby2004@gmail.com (Eldhose) — Tue, 10 Nov 2009 11:17:00 +0000

There is a river which is 4100 inches wide, and the bridge across the
river is in such a way that one seventh of the overall length of the
bridge was on one side of the river and one eighth of the bridge was
on the other side of the river.
Find the total length of the bridge?

[Note: The bridge perfectly straight]

Chess board problem

eldhosebaby2004@gmail.com (Eldhose) — Mon, 02 Nov 2009 09:47:00 +0000

what is maximum no. of kings which can be placed on a chessboard so
that no 2 of them put each other in check?
[provided all kings are of one color and check rule is applicable to
same color kings]

dumb & deaf

eldhosebaby2004@gmail.com (Eldhose) — Thu, 22 Oct 2009 14:05:00 +0000

How can a deaf man without the help of anyone confirm that
he is not dumb?

15, 161, 1771, 19481, 214291,______?

eldhosebaby2004@gmail.com (Eldhose) — Mon, 12 Oct 2009 05:36:00 +0000

Next number in the sequence
15, 161, 1771, 19481, 214291 is

Options:

1) 1942651
2) 135611101
3) 2424561
4) 1357101
5) 345372101
6) 1357201
7) 23651121
8) 1764924
9) 125461
10) 234255

A man wanted to get into his work building....

eldhosebaby2004@gmail.com (Eldhose) — Thu, 24 Sep 2009 12:15:00 +0000

A man wanted to get into his work building, but he had forgotten
his code. However, he did remember five clues.
These are what those clues were:

# The fifth number plus the third number equals fourteen.
# The fourth number is one more than the second number.
# The first number is one less than twice the second number.
# The second number plus the third number equals ten.
# The sum of all five numbers is 30.

What were the five numbers and in what order?

Hourglass puzzles

eldhosebaby2004@gmail.com (Eldhose) — Tue, 22 Sep 2009 14:51:00 +0000

You have two sand hourglasses, one that measures exactly 4 minutes
and one that measures exactly 7 minutes. You need to measure out
exactly 2 minutes to boil an egg. Using only these two hourglasses,
how can you measure out exactly 2 minutes to boil your egg?

Amazing Sentences

eldhosebaby2004@gmail.com (Eldhose) — Wed, 09 Sep 2009 11:35:00 +0000

Write a meaningful sentence of 15 words in such a way that the first
word is of one letter long, second word of two letters, third word
is three letters long ............ 8th word is 8 letters long
and so on ... until the 15th word is 15 letters long !!!

(If you are successful with 15 words then try using 20 words)

Prisoners and hats puzzles

eldhosebaby2004@gmail.com (Eldhose) — Wed, 09 Sep 2009 05:25:00 +0000

4 prisoners are caught and are to be punished. The Judge allows them
to be freed if they can solve a puzzle.
If they do not, they will be hung. They agreed.

The 4 prisoners are lined up on some steps (shown above). They are
all facing in the same direction. A wall separates the fourth man
from the other three.

So to summarize:-
Man 1 can see men 2 and 3.
Man 2 can see man 3.
Man 3 can see none of the others.
Man 4 can see none of the others.

The prisoners are wearing hats. They are told that there are two white
hats and two black hats. The men initially don't know what colour
hat they are wearing. They are told to shout out the color of the hat
that they are wearing as soon as they know for certain what colour
it is.

They are not allowed to turn round or move.
They are not allowed to talk to each other.
They are not allowed to take their hats off. Who is the first person
to shout out and why?

100 doors in a row problem

eldhosebaby2004@gmail.com (Eldhose) — Wed, 26 Aug 2009 14:02:00 +0000

There are 100 doors in a row numbered from 1 to 100. Initially all
are closed. Then you make 100 passes by the 100 doors. In pass 1 you
toggle the all the doors (1,2,3,4....)starting from the first door.
In the second pass you toggle every second door(2,4,6,8,...). In the
third pass you toggle all third doors (3,6,9...). Similarly you make
100 passes.

what state are the doors in after the last pass?

which are open which are closed??

Unusual paragraph

eldhosebaby2004@gmail.com (Eldhose) — Mon, 24 Aug 2009 07:02:00 +0000

What is unusual about this paragraph? You will find that this is not
just an ordinary paragraph if you look at its words. An odd group of
words this is! Can you find what it is?

Golo is locked in a cave !!!

eldhosebaby2004@gmail.com (Eldhose) — Tue, 11 Aug 2009 08:58:00 +0000

Golo is locked in a cave. He is having 2 vessels with him (5ltr & 7ltr).
The gate of the cave will open only when there are exactly 6 litres on
the handle. He can take as much water as he want from the nearby
water well. How he can make combinations such that the 7 ltr vessel
will have exactly 6 liters of water?

Picture Puzzles

eldhosebaby2004@gmail.com (Eldhose) — Wed, 05 Aug 2009 07:21:00 +0000

Comparison of the areas of the 2 shapes creates a paradox: 64 = 65

How is this possible?

FORTY + TEN + TEN = SIXTY

eldhosebaby2004@gmail.com (Eldhose) — Tue, 28 Jul 2009 14:20:00 +0000

Each of the letters in the equation below represents one of the
digits from 0 to 9. Determine which digit corresponds to each letter.

FORTY
+ TEN
+ TEN
-----
SIXTY

Race track problem

eldhosebaby2004@gmail.com (Eldhose) — Wed, 22 Jul 2009 07:46:00 +0000

A Race track is one mile long, if a driver goes around once at
30 miles per hour, how fast must he drive in the second lap to
average sixty miles per hour over both laps?

Logic riddles

eldhosebaby2004@gmail.com (Eldhose) — Wed, 15 Jul 2009 14:09:00 +0000

A horse have to transfer bananas from one point to the other point
(points are 1000km apart). He can take atmost 1000 bananas at a time
and he eats 1 banana after every km he travels. Tell me the
maximum no. of bananas he can take to the final point if the total
no. of bananas are 3000 ?

The ultimate age problem

eldhosebaby2004@gmail.com (Eldhose) — Thu, 09 Jul 2009 12:49:00 +0000

Varun is 33 years old. This is three times as old as Tharun was when
Varun was as old as Tharun is now...

How old is Tharun now ?

Clock time puzzles

eldhosebaby2004@gmail.com (Eldhose) — Tue, 07 Jul 2009 10:28:00 +0000

If it were two hours later, it would be half as long until midnight
as it would be if it were an hour later.

What time is it now?

Tricky puzzles

eldhosebaby2004@gmail.com (Eldhose) — Mon, 22 Jun 2009 14:11:00 +0000

A bottle of soda costs $3. The soda is worth $2 more than the bottle.
How much is the bottle worth?

If 2+3=10, 7+2=63, 6+5=66, 8+4=96...

eldhosebaby2004@gmail.com (Eldhose) — Mon, 15 Jun 2009 12:32:00 +0000

If 2+3=10, 7+2=63, 6+5=66, 8+4=96

Then find 9+7 = ?

The Monty Hall Trap

eldhosebaby2004@gmail.com (Eldhose) — Fri, 12 Jun 2009 13:54:00 +0000

“Suppose you are on a game show, and you are given the choice
of three doors: Behind one door is a Rolls Royce car and behind
the others, goats. Let's assume that you would prefer a Rolls Royce
to a goat. You pick a door, say No.1, and the host, who knows
what's behind the doors, opens another door, say No.3, which has
a goat. He then says to you, "Do you want to pick door No. 2?

Is it to your advantage to switch your choice?”

The toy vendor puzzle

eldhosebaby2004@gmail.com (Eldhose) — Tue, 09 Jun 2009 11:17:00 +0000

A toy vendor is selling toys from door to door.He visits a house
& asks the owner lady to buy toys for her kids. Lady, being a
smart customer, says to Toy Vendor “If you can tell me the ages
of my 3 Kids correctly then only I will buy Toys from you.”
Toy Vendor says “OK M’am , Please give me some clue”

“If you multiply ages of my 3 kids you get figure 36.And if you add
ages of my 3 kids you get House Number of my neighbour” replies Lady.

Toy Vendor thinks for a while , goes & notes Number of Neighbour’s
house & returns saying “M’am , some more information is required”

“OK, my eldest daughter plays Harmonium very nicely” replies Lady.
“Oh, in that case I have got answer to your question”
replies Toy Vendor & tells the Lady the correct ages of her Kids.

Can you tell ages of Lady’s Kids ?
What is House Number of Lady’s Neighbour ??

1, 2, 6, 42, 1806, ?

eldhosebaby2004@gmail.com (Eldhose) — Mon, 08 Jun 2009 06:24:00 +0000

Find the next number in the series...

Famous Logic Puzzles

eldhosebaby2004@gmail.com (Eldhose) — Fri, 05 Jun 2009 04:57:00 +0000

A king wants an advisor and comes to ask the 3 wisest sages.
He blindfolds them and put the hats on their head. Afterwards,
the king takes off their blindfolds. He tells them that
their hat is either blue or white. He tells them that whoever
can deduce the color of their hat will be his next advisor.
Also he tells them that at least one of the sages will be
wearing a blue hat. The sages can all see each other's hats
except of course, their own. Sage A sees that the other 2 are
wearing blue hats.
For hours no one spoke, then Sage A stands up and tells the
king the colour of his hat. What color is it and how does he know?

Number Lock Problems

eldhosebaby2004@gmail.com (Eldhose) — Fri, 29 May 2009 05:42:00 +0000

There is a safe with a 5 digit Number lock. The 4th digit is 4
greater than second digit, while 3rd digit is 3 less than 2nd digit.
The 1st digit is thrice the last digit. There are 3 pairs whose
sum is 11. Find the number ?

Lateral Thinking Problems

eldhosebaby2004@gmail.com (Eldhose) — Thu, 21 May 2009 07:08:00 +0000

1)How could a baby fall out of a twenty-story building onto
the ground and live?

2)There are six eggs in the basket. Six people each take
one of the eggs. How can it be that one egg is left in the basket?