• Views : 40k+
  • Sol Viewed : 10k+

Mind Teasers : Toughest Long Logic Puzzle

Difficulty Popularity

The puzzle question is : On Bagshot Island, there is an airport. The airport is the home-base 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)

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  • Views : 80k+
  • Sol Viewed : 20k+

Mind Teasers : Playing Cards Puzzle

Difficulty Popularity

I purchased five decks of card from the market and mixed them.
Now i have ( 5 * 52 = 260 cards).

What is minimum number of cards, i need to take out from the above 260 cards to guarantee at least one 'four of a kind'.

  • Views : 80k+
  • Sol Viewed : 20k+

Mind Teasers : Best Thinking Brain Teaser Ever

Difficulty Popularity

Three men are living in a desert namely – Alex, Brian and Chris.

Alex hates Chris and thus he decides to kill him. To succeed in his evil intentions, he poison the water supply of Chris. Since they are living in desert, he will have to drink water or he will die of thirst.

Brian is not aware of the actions of Alex and he plans to kill Chris as well. To do this, he killed the water supply of Chris.

Chris dies due to his thirst. Who killed him?

By Admin
  • Views : 40k+
  • Sol Viewed : 10k+

Mind Teasers : Trick Relationship Riddle

Difficulty Popularity

If Erica's daughter is my daughter's mom, who am I to Erica?

  • Views : 70k+
  • Sol Viewed : 20k+

Mind Teasers : Game Of Dice Brain Teaser

Difficulty Popularity

A unique solo game of dice is being played. Two dices are thrown in each turn and the scores are taken by multiplying the numbers obtained.

Now talking about a particular game, here are the facts:
1) The score for the second roll is five more than the score for the first roll.
2) The score for the third roll is six less than the score for the second roll.
3) The score for the fourth roll is eleven more than the score for the third roll.
4) The score for the fifth roll is eight less than the score for the fourth roll.

Reading the above facts, can you tell the score for each of the five throws?

  • Views : 80k+
  • Sol Viewed : 20k+

Mind Teasers : Numbers For Buildings Problem

Difficulty Popularity

My town contains 100 buildings.
They are numbered from 1 to 100. How many 6's are used in these numbers ?

  • Views : 70k+
  • Sol Viewed : 20k+

Mind Teasers : Tricky Probabilty Problem To Solve

Difficulty Popularity

Aishwarya was first to board to her flight to delhi.
She forgot her seat number and picks a random seat for herself.
After this, every single person who get to the flight sits on his seat if its available else chooses any available seat at random.
Abhishek is last to enter the flight and at that moment 99/100 seats were occupied.

Whats the probability what Abhishek gets to sit in his own seat ?

  • Views : 40k+
  • Sol Viewed : 10k+

Mind Teasers : Very Hard Math Question

Difficulty Popularity

There stand nine temples in a row in a holy place. All the nine temples have 100 steps climb. A fellow devotee comes to visit the temples. He drops a Re. 1 coin while climbing each of the 100 steps up. Then he offers half of the money he has in his pocket to the god. After that, he again drops Re. 1 coin while climbing down each of the 100 steps of the temple.

If he repeats the same process at each temple, he is left with no money after climbing down the ninth temple. Can you find out the total money he had with him initially?

  • Views : 60k+
  • Sol Viewed : 20k+

Mind Teasers : Scrooge McDuck Adventure Logic Puzzle

Difficulty Popularity

Scrooge McDuck plans to go to the Treasure Island.
It needed six days to reach there.
One person can carry food and water for just four days.

What is the fewest number of more people McDuck needed, to help him to carry enough food and water for this adventurous journey ?

  • Views : 70k+
  • Sol Viewed : 20k+

Mind Teasers : Maths Magic Riddle

Difficulty Popularity

I can prove why 1 = 2

Step1. Lets say y = x
Step2. Multiply through by x xy = x2
Step3. Subtract y2 from each side xy - y2 = x2 - y2
Step4. Factor each side y(x-y) = (x+y)(x-y)
Step5. Divide both sides by (x-y) y = x+y
Step6. Divide both sides by y y/y = x/y + y/y
Step7. And so... 1 = x/y + 1
Step8. Since x=y, x/y = 1 1 = 1 + 1
Step9. And so... 1 = 2

How is this possible ?

  • Views : 80k+
  • Sol Viewed : 20k+

Mind Teasers : Logical Interview Problem

Difficulty Popularity

Jonathan has three boxes containing milk chocolates and dark chocolates. The problem is that all of them have been labeled incorrectly as follows.
Box1: Dark Chocolates
Box2: Milk Chocolates
Box3: Dark Chocolates and Milk Chocolates

How will he label all the boxes correctly by just opening one box?

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