Mind Teasers : 4 + 9 != 13

Difficulty Popularity

If the following is true, can you find the value of (4 + 9)?

7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9
category : LOGIC | SERIES

Suggestions

Mind Teasers : Famous Priest Well Puzzle

Difficulty Popularity

An old priest fell on a bottom of the well of a church.
The well is 20 inches deep.

At day time, the old priest climbs 5-inches but when at dark he slip back 4 inches.
In how many days priest will come out of the well ?

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 : Nice Mathematics Riddle

Difficulty Popularity

Aishwarya Rai walks into a bank to cash out her check.
By mistake the bank teller gives her dollar amount in change, and her cent amount in dollars.
On the way home she spends 5 cent, and then suddenly she notices that she has twice the amount of her check.

How much was her check amount ?
category : LOGIC | MATHS

Mind Teasers : The sheep and the grass logical puzzle

Difficulty Popularity

If we tie a sheep to one peg, a circled grass is been eaten by the sheep. If we tie the sheep to two pegs with a circle on its neck, then an eclipse is eaten out of the grass by the sheep. If we want an eclipse then we put two pegs then put a rope in between then and the other end of the rope is tied up on the sheep's neck.

Question: how should we tie the peg and the sheep so that a square is eaten out from the garden's grass? We only have one sheep's rope and the peg and the rings.
category : LOGIC

Mind Teasers : Cool Equation Riddle

Difficulty Popularity

If 1 + 9 + 11 = 1, Then what is the value of

12 + 11 + 9 = ?

Mind Teasers : Awesome Logic Problem

Difficulty Popularity

I went for an official tour in a big city where there are over 100 buildings.
Building-1 is named first building.
Building-2 is named second building.
Building-3 is named third building.

A visitors decides to walk through all the buildings, he finds all the buildings except building-62.
Visitor later founds that the local of the city have given it another name.

What is the name of the Building ?
category : LOGIC | TRICK

Mind Teasers : Eight Eights Brain Teaser

Difficulty Popularity

Using eight eights and addition only, can you make 1000?
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 : Logical Problem

Difficulty Popularity

Four stupid friends meet each other after long time.They are so stupid that they start talking about their suits

* There were a total of eight suits, two in each color, black, brown, pink and white.
* Each friend owned two suits.
* No friend had two suits of the same color.
* Ganpat don't have a white suit.
* Harish don't have a black suit, but did have a brown one.
* One of the friends had a white suit and a pink suit and another friend had a brown suit and a pink suit.
* Manoj had a white suit.
* Tarun had a pink suit, but don't have a brown one.

Can you work out which friend had which color suits?
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?

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