Mind Teasers : Conditional Probability Brain Teaser

Difficulty Popularity

The students of a particular class were given two tests for evaluation. Twenty Five percent of the class cleared both the tests and forty five percent of the students were able to clear the first test.

You have to calculate the percentage of those students who passed the first test and were also able to pass the second test. How will you do it?

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Mind Teasers : Awesome Probability Logic Riddle

Difficulty Popularity

You need to divide 50 marbles(25-red and 25-blue) into two boxes such that the probability of picking red marble is maximized.

Following conditions need to hold true :
1. None of box is empty
2. All the marbles must be in one of two boxes.
category : LOGIC

Mind Teasers : Logic Coins Puzzle

Difficulty Popularity

Assuming i have an infinite supply of coins.

What is the fewest number of coins would be required in order to make sure each and every coin touched exactly three other coins.

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 ?
category : LOGIC

Mind Teasers : Hidden Bird In Snow Picture Riddle

Difficulty Popularity

Can you find the hidden bird in the picture (winter time) below?

category : PICTURE

Mind Teasers : Water Measurement Riddle

Difficulty Popularity

A barman is having a 12 liters jug full of beer. He needs to divide or split that beer into two equal parts. All he has is two empty jugs of capacity 8 liters and 5 liters.

How will he do it using them?
category : LOGIC | MEASURE

Mind Teasers : Passcode Puzzle

Difficulty Popularity

Shruti's daughter Arshika need to be picked from the school every day.
Shruti asks one of her colleagues to pick her from school. Shruti devised a password mechanism to confirm that Arshika goes with the correct person only.
The password on Monday was SAM16.
The password on Wednesday was HRW39.

What will the password for Friday?


category : LOGIC | CIPHER

Mind Teasers : Spatial Trivia Physics Puzzle

Difficulty Popularity

As shown in picture, there are four gears with the following specification
* Gear A has 60 teeth
* Gear B has 40 teeth
* Gear C has 20 teeth
* Gear D has 60 teeth
* Every minute, Gear B makes 15 complete turns.

What is the relative speed of Gear A and Gear B?

Mind Teasers : Murder Mystery Brain Teaser

Difficulty Popularity

A homicide detective is called upon a crime scene. He finds that a body is lying on the ground in front of a multistory building. By all the means, it looks like a simple suicide case. But there are doubts in his mind.

He goes to the first floor and moves into the room facing the direction of the body. He opens the window in that direction and looks down towards his team. The he goes to the second floor and again moves into the room facing that direction, opens the window and looks down at his team.

He continues with the same process till the top floor. After that, he returns back to where his team is standing. He tells them that it is a suicide.

How did he come to such a conclusion?

Mind Teasers : Smart Brain Teaser

Difficulty Popularity

A man wronged the king and thus he was put under a trial for murder. But the king knew that the person was innocent. Also he was suspicious that his innocence will soon come out among the people. Thus, he decided to play a game of chance on the name of their almighty god.

He summoned all the people along with the accused person. He put in two chits of paper inside a bowl. He told the people that one chit has ‘Guilty’ written over it and the other one has ‘Innocent’ written over it. He tells the people that the god will decide if the accused person is culprit or not. He then asks the person to draw a chit.

Obviously, the king is cheating and he has written ‘Guilty’ over both the chits. So no matter what chit the person picks, everybody will believe that it is lord's judgment and no one will bother to look at the other chit. Even the accused person knows it that the king had played a full proof game.

What should he do in order to be conceived as an innocent person?

Mind Teasers : Red | Blue | White Logical Riddle

Difficulty Popularity

At a restaurant downtown, Mr. Red, Mr. Blue, and Mr. White meet for lunch. Under their coats they are wearing either a red, blue, or white shirt.Mr. Blue says, 'Hey, did you notice we are all wearing different colored shirts from our names?' The man wearing the white shirt says, 'Wow, Mr. Blue, that's right!'
Can you tell who is wearing what color shirt?
category : LOGIC

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