Brain Teasers & Puzzles
-
You are trying to cook an egg for exactly fifteen minutes, but instead of a timer, you are given two ropes which burn for exactly 1 hour each. The ropes, however, are of uneven densities – i e , half the rope length-wise might take only two minutes to burn. How can you cook the egg for exactly fifteen minutes?
View SolutionSubmit Solution- 1,641.0K views
- 2 answers
- 1 votes
-
On Bagshot Island, there is an airport. The airport is the homebase of an unlimited number of identical airplanes. Each airplane has a fuel capacity to allow it to fly exactly 1/2 way around the world, along a great circle. The planes have the ability to refuel in flight without loss of speed or spillage of fuel. Though the fuel is unlimited, the island is the only source of fuel.
What is the fewest number of aircraft necessary to get one plane all the way around the world assuming that all of the aircraft must return safely to the airport? How did you get to your answer?Notes:
(a) Each airplane must depart and return to the same airport, and that is the only airport they can land and refuel on ground.
(b) Each airplane must have enough fuel to return to airport.
(c) The time and fuel consumption of refueling can be ignored. (so we can also assume that one airplane can refuel more than one airplanes in air at the same time.)
(d) The amount of fuel airplanes carrying can be zero as long as the other airplane is refueling these airplanes. What is the fewest number of airplanes and number of tanks of fuel needed to accomplish this work? (we only need airplane to go around the world)View SolutionSubmit Solution- 1,645.9K views
- 3 answers
- 0 votes
-
You are the ruler of a medieval empire and you are about to have a celebration tomorrow. The celebration is the most important party you have ever hosted. You’ve got 1000 bottles of wine you were planning to open for the celebration, but you find out that one of them is poisoned.
The poison exhibits no symptoms until death. Death occurs within ten to twenty hours after consuming even the minutest amount of poison.
You have over a thousand slaves at your disposal and just under 24 hours to determine which single bottle is poisoned.
You have a handful of prisoners about to be executed, and it would mar your celebration to have anyone else killed.
What is the smallest number of prisoners you must have to drink from the bottles to be absolutely sure to find the poisoned bottle within 24 hours?
View SolutionSubmit Solution- 1,646.2K views
- 3 answers
- 1 votes
-
The king’s only children, Abel, Benjamin and Paula, went into the forest with their friend, the elderly Sir Kay. They wanted to try their skill with their bows and arrows. Each of them started with same number of arrows.
When all the arrows had been shot, it was discovered that:1. Sir Kay brought down more game than Princess Paula.
2. Prince Benjamin captured more than Sir Kay.
3. Princess Paula’s arrows went truer than Prince Abel’s.Who was the best marksman that day?
View SolutionSubmit Solution- 1,641.3K views
- 1 answers
- 1 votes
-
Meanwhile, back at the castle, the ogre found that the
boots he had picked at random from his dark storeroom
were all six-league boots. He threw them back. He
needed seven-league boots so that he could cover more
territory.
If in that dark storeroom he had four six-league boots
and eight seven-league boots, how many boots did he
have to pull out to make sure he had a pair of sevenleague
boots?View SolutionSubmit Solution- 1,639.2K views
- 1 answers
- 0 votes
-
The king had his doubts about his sons’ fighting
skills, and so he sent his two eldest to the court magidan
for potions to help fight the ogre.
The magician kept his magic hidden, mindful of the
danger of his potent potion falling into the wrong
hands. In a secret but inconvenient compartment in his
laboratory, he hoarded:
1. four ogre-fighters
2. three dragon-destroyers
3. two evil wizard-vanquishers
How many potions did he have to reach for in order
to make sure that he could give an ogre-fighter to each
of the king’s two sons?View SolutionSubmit Solution- 1,639.4K views
- 1 answers
- 0 votes
-
To enlist the help of the other kingdoms, the king talked to the queen about inviting neighboring royalty to dinner. This put the queen into a royal snit. Theirs was not a very wealthy kingdom and the royal dinnerware was in a disgraceful condition. Apart from ordinary dishes for everyday use, all that the royal pantry contained were a few dinner plates of three different
dinner patterns:
1. five silver ones with birds
2. six crystal with seashells
3. seven gold with the royal crest
They were all stored in disarray on a very dark top shelf of the royal pantry. Only those would be suitable for entertaining other royalty.
If the queen didn’t want to climb up to the top shelf twice, how many dinner plates would she have to take down to be sure she had matching dinner plates for herself, her royal spouse, and for the neighbouring king and queen?View SolutionSubmit Solution- 1,642.9K views
- 1 answers
- 1 votes
-
The local king, determined to defend his kingdom from that wicked ogre, sent his two eldest sons to the court swordsmith.
The swordsmith kept a supply of special ogrefighters (four daggers, three swords and two axes) locked in a chest. The two princes insisted on having the same kind of weapon.
How many weapons did the swordsmith have to take out of the chest to be sure he could meet the demands of the princes?View SolutionSubmit Solution- 1,640.8K views
- 1 answers
- 0 votes
-
Planning to roam the countryside and prey upon its
defenseless people, the ogre reached into his dark
closet. There he had stored four six-league boots and
eight seven-league boots. How many boots did he have
to pull out of the closet to make sure he had a pair that
matched?View SolutionSubmit Solution- 1,639.6K views
- 1 answers
- 0 votes
-
On the day before the spacecraft was to return to
Earth, the Martians held a dinner party for the crew. In
all there were eight at the table: Aken, Bal, Mun, Mark,
Wora, Jones, Rider and Smith.
a. One was a history buff.
b. One was a whiz at math.
c. One was very tall.
d. One was Aken’s friend.
e. One had yellow feathers.
f. One was a pilot.
g. One was a rock collector.
h. One spoke a number of languages.
1. The person who was Aken’s friend sat directly
opposite Mark.
2. Wora sat between the math whiz and Aken’s
friend.
3. The tall one sat opposite Wora, with Aken to her
left.
4. Smith, who had no real friends among the group,
sat to the right of Mun who towered over the rest
of the group.
5. The one who had yellow feathers sat opposite Bal,
between Mun and the one who spoke a number of
languages.
6. Jones was to the right of the rock collector and
opposite the pilot who was next to Rider.
Who was Aken’s friend?View SolutionSubmit Solution- 1,640.1K views
- 1 answers
- 0 votes
More puzzles to try-
Cricket Run Riddle
John has played 50 ODI’s and his average is 50. How many runs should he score in his 51st ODI, ...Read More »I’m teary-eyed but never cry riddle
I’m teary-eyed but never cry. Silver-tongued, but never lie. Double-winged, but never fly. Air-cooled, but never dry. What am I?Read More »Eye in the eye riddle
An eye in a blue face saw an eye in a green face. ‘That eye is like to this eye’ ...Read More »Travel but stays in home
I like to roam but I’ll always stay home, He likes to travel but stays in home, He leaves a ...Read More »The Road Sign
The how-to-drive manual is being updated and somehow all the road sign definitions got mixed up. The pictures below are ...Read More »Which door to open puzzle
While driving his car a man slams on the brakes when he sees, in the middle of the street, A ...Read More »What is the smallest time interval that can be measured?
You are given some matches, a rope, and a pair of scissors. The rope burns irregularly and takes 60 minutes ...Read More »Around the world
Why can\’t the world ever come to an end ?Read More »What did you order?
Five bachelors who all lived in the same apartment building each ordered an item from the same catalog. Unfortunately, the ...Read More »As I was going to St. Ives,
As I was going to St. Ives, I met a man with seven wives, Each wife had seven sacks, Each ...Read More »Find the leopard
A leopard is hiding in plain sight in the bushes. Only the sharpest eyes can spot the elusive cat. Can ...Read More »Paintball Match Puzzle
Kohli and Dhoni decided to have a paintball match. Kohli told Dhoni, “Sir it is not right as you got ...Read More »Ten Letter Word
I know a ten-letter word in the English language which can be typed using only the top rows of the ...Read More »Turn again
It turns around once, what is out will not get in. It turns around again, what is in will not ...Read More »How long would it take for the water to reach the lifeboat.
A shrimping boat is at the docks with a lifeboat hanging off the side 5 meters above the water. If ...Read More »What number should he have said to get in?
You want to go to a club but to get in you must respond correctly to what the bouncer says. ...Read More »Find Length of a Linked List (Iterative)
Write a C function to count number of nodes in a given singly linked list. For example, the function should ...Read More »Orange Distribution riddle
A kind gentleman decided to give 10 oranges to each of the girls in his town and 5 oranges to ...Read More »Who killed Mr. John
Mr. John lives in a mansion. He is very rich. He is so rich that he has a maid, a ...Read More »Not a suicide
A man was found dead next to a 11 story building. The police say it was a suicide, but you ...Read More »
