Mind Teasers : Most Popular Logical Puzzle

Difficulty Popularity

Outside a room there are three light switches. One of switch is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb ??
category : LOGIC

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Mind Teasers : Logical Marble Riddle

Difficulty Popularity

There is a box which have 33 yellow marbles and 35 green marbles. You also have 34 green marbles outside the box.

Randomly remove two marbles from the box.
* If they are of different colors, put the yellow one back in the box.
* If they are the same color, take them out and put a green marble back in the box.

Repeat this until only one marble remains in the box.


What is the color of the sole marble left in the box ?
category : LOGIC

Mind Teasers : Palindrome Number Riddle

Difficulty Popularity

There can be myriad ways to create a palindrome. One day, I thought of making my own palindrome. I thought of a number and then decided to add the reversed number to it. Sadly, I did not get a palindrome.

So I kept repeating this step and eventually I succeeded in creating a palindrome. I don't know if you can always create a palindrome using this method but I was able to generate one of four digits.

Can you tell me the number at which I started?
category : LOGIC | MATHS

Mind Teasers : Find Out Who Survives Riddle

Difficulty Popularity

100 people are standing in a circle. The person standing at number 1 is having a sword. He kills the person next to him with the sword and then gives the sword to the third person. This process is carried out till there is just one person left.

Can you find out who survives?
category : LOGIC | MATHS

Mind Teasers : Extremely Hard Civil Services Problem

Difficulty Popularity

( ) + ( ) + ( ) + ( ) + ( ) = 30
This is what you have for equation. The following are the numbers that you can use to fill in the brackets:
1, 3, 5, 7, 9, 11, 13 and 15

You can repeat the numbers if required. The resulting sum should be 30.

This question appeared in the UPSC final examination in December 2013. Out of all the people who appeared, only one guy was able to solve this namely Gaurav Agarwal.

Can you solve it?

Mind Teasers : The Better Proposal Puzzle

Difficulty Popularity

A 12-year footballer Lavy was offered a contract with a club name "Flyball" that if he will practice 1 hour extra after school he will be offered 11$ after every week.
Lavy, however, suggested an alternative paid method in which
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till 11th day.

Should the club accept the offer of Lavy?

category : LOGIC | MATHS

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 ?
category : LOGIC | SITUATION

Mind Teasers : Quick Thinking Maths Problem

Difficulty Popularity

A petri dish kept in a lab has a colony of healthy bacteria. Every bacterium divides itself into two in exactly two minutes. Now the colony started with a single cell at 2 pm. If the petri dish was exactly half full of bacteria at 3 pm, when will the dish become full of bacteria?

Mind Teasers : World War I History Riddle

Difficulty Popularity

Two companions Terry and Garry were talking about their families. Terry told some great stories about his courageous grandfather who fought for Britain in "World War I". Terry told that his grandfather is so brave that he was awarded a bravery honour medal with words "For our Courageous Soldiers In World War I" embedded into it.

Garry Knows that his friend is lying? How ?

Mind Teasers : Logical Maths Gold Bar Brain Teaser

Difficulty Popularity

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?
category : LOGIC | MATHS

Mind Teasers : Math Trick Riddle

Difficulty Popularity

Removing one from eleven makes it ten and removing one from nine makes it ten.

Is it even possible?

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