Mind Teasers : Tricky Maths Expression

Difficulty Popularity

By using the numbers 8,5 1 and 1 exactly once and with the help of basic operation (+, -, /, *), Can you form an expression with a value of 10?

Note: Parentheses are allowed
category : MATHS | EQUATION


Mind Teasers : Find KIller From Calendar Puzzle

Difficulty Popularity

In a friend's get together party on New Year's Eve, a power cut takes place unexpectedly. When the lights go live again, it is found that Joseph, one of the friends has been stabbed to death. Since no one else had the access to the party, the killer is one of the friends only.

Police are called and they search the surroundings for any evidence, but can't find any. Upon checking the pockets of Joseph's pants, they find a pocket calendar and they find out that it has been marked and can also find some numbers written on it.

You can see the calendar attached with this question.

You don't know the name of the friends who were there at the party. Can you still decipher the name of the killer through the picture?

category : MYSTERY

Mind Teasers : Hard Logical Puzzle

Difficulty Popularity

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?
category : LOGIC

Mind Teasers : Popular Logic Brain Teaser

Difficulty Popularity

A girl liked to collect money in a piggy bank. She bought pink colored piggy bank when she was 10 years old. She put $250 in the box on each of her birthday. Her younger sister took $50 out of her piggy bank on her birthday. The girl died when she was 50 years old due to an incurable disease.

When the piggy bank was opened, it had just $500. How can that be possible?
category : LOGIC | MATHS

Mind Teasers : 12 Sum Matchstick Brain Teaser

Difficulty Popularity

We have arranged matchsticks in a manner that all the first row, second row, first column and third column contain 12 matchsticks each. Can you remove 4 matchsticks and rearrange all the remaining matchsticks that we are still left with 12 matchsticks in the first row, second row, first column and the third column.

Mind Teasers : Most Popular Monty Hall Brain Teaser

Difficulty Popularity

The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.

After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter ?

Mind Teasers : Solve Magic Square Riddle

Difficulty Popularity

You have to place all the digits from 1 to 9 without repeating any number in a tic tac toe board. The condition is that the numbers should add up to 15 whether you add the numbers in each row, column or diagonally.

Can you do it?
category : LOGIC

Mind Teasers : Probability To Choose Own Toy Brain Teaser

Difficulty Popularity

I bought three toys for my triplet boys (one for each). I placed the toys in the dark store. One by one each boy went to the store and pick the toy. What is the probability that no boy will choose his own toy?

Mind Teasers : Brain Twister For Kids

Difficulty Popularity

A clever robber breaks into a closed bank where he finds a clerk. He asks password of the safe from the clerk while pointing a gun on his forehead. Out of fear, the clerk manages to blurt out, “Every day, the password of the safe is changed. I can help you but please point away the gun as if you kill me, you will never be able to crack the password.

The robber ties the clerk on a chair and insert a cloth in his mouth. He then easily opens the safe after inserting the code and takes all the money before he flees.

How did he know the password ?

Mind Teasers : Birbal Brain Teaser

Difficulty Popularity

Birbal is a witty trader who trade of a mystical fruit grown far in north. He travels from one place to another with three sacks which can hold 30 fruits each. None of the sack can hold more than 30 fruits. On his way, he has to pass through thirty check points and at each check point, he has to give one fruit for each sack to the authorities.

How many mystical fruits remain after he goes through all the thirty check points?

Mind Teasers : Hard Logic Puzzle

Difficulty Popularity

A great meeting is held by a great logician where all the other logicians are called upon. The master logician takes them in a room and makes them sit in circle. A hat is placed on each of their heads. Now all of them can see the color of hats others are wearing but can’t see his own. They are told that there different colors of hats.

The master logician explains that a bell will be rung at regular intervals and the moment when a logician knows the color of his hat, he will leave on the next bell. If anyone leaves at the wrong bell, he will be disqualified and sent home.

All of them are assured of one thing that the puzzle will not be impossible for anyone of them. How will they manage the situation?
category : LOGIC

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