Mind Teasers : The Hundred Number Puzzle

Difficulty Popularity

We can create number 100 by using all numbers, i.e.0123456789 and mathematical operators (+/-) in many ways.
Example
98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100

But if we add a condition that the use of the number 21 is the must. Then there are only a few solutions.

One of such solution is:
98 - 7 - 6 - 5 - 4 + 3 + 21 = 100

Can you tell any other solution?
category : SERIES | MATHS

Suggestions

Mind Teasers : Interview Marble Logic Puzzle

Difficulty Popularity

You are given a set of scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to conclude either that the contents of the dishes weigh the same or that the dish that falls lower has heavier contents than the other.
The 12 marbles appear to be identical. In fact, 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more.

Note that the unusual marble may be heavier or lighter than the others. You are asked to both identify it and determine whether it is heavy or light.
category : LOGIC

Mind Teasers : Trick Gift Brain Teaser

Difficulty Popularity

Cindy opened twenty five presents.
Duke opened five presents.
John opened fifteen presents.

Judging by the statements, can you decipher how many presents will be opened by Rhea?
category : LOGIC | TRICK

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

Mind Teasers : Maths Logical Brain Teaser

Difficulty Popularity

A man of faith visits the holy land where three temple are erected in a row offering a surreal divinity to the place. Awestruck at the sight of the magnificent temples, he visits the first temple where he finds that the number of flowers in his basket increases to double the number as soon as he sets his foot inside the temple. Astonished by the miracle he is completely happy and seeks it as a blessing of his god. He offers a few flowers to the stone idol of god and moves out.

Then he visits the second temple, where the same miracle happens again. The number of flowers in his basket again double up in number. With a smile on his face, he offers a few of flowers to the stone idol again and walks out after praying.

The moment he enters the third temple, the number of flowers increases to double again. Now he feels entirely blessed. He offers all the flowers at the feet of the stone idol and walks out in a moment of bliss.

When he walks out, he has no remaining flowers with him. He offered equal number of flowers at each of the temple. What is the minimum number of flowers he had before entering the first temple? How many flowers did he offer at each temple?
category : LOGIC

Mind Teasers : Ten From Nine Toothpicks Trick Riddle

Difficulty Popularity

If you were asked to pick nine toothpicks and make them ten without breaking any of them, how will you do it?

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 : The Girl Riddle

Difficulty Popularity

You see a beautiful girl sitting. You can't sit on her place even if she standup and the leave the place.

Where is she sitting?

category : LOGIC | TRICK

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 : Brothers Ias Smart question

Difficulty Popularity

Two brothers have developed differences among themselves and thus want to part ways. The problem is that they have one big land that is irregular in shape. Both of them want an equal share which is fairly impossible as there is no way that land could be divided in equal halves due to irregularity in the shape.

The wisest man of the village is called who tells a way in which both of them will be happy even though the land might not be divided into exactly equal halves.

What way did he suggest?
category : LOGIC | RIDDLE

Mind Teasers : Hard Logic Statement Riddle

Difficulty Popularity

There are a hundred statements.
1st person says: At least one of the statements is incorrect.
2nd person says: At least two of the statements is incorrect.
3rd person says: At least three of the statements are incorrect.
4th person says: At least four of the statements are incorrect.
..
..
..
100th person says: At least a hundred of the statements are incorrect.

Now analyze all the statements and find out how many of them are incorrect and how many are true?

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