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Site Title:	Brain Teasers
Site Description:	Printable brain teasers for kids and adults, riddles, logic puzzles, paradoxes, optical illusions, IQ tests, free brain games, lawyer jokes and other challenges for your mind.

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Simple And Funny
all the puzzles i know been posted here so i rememberd this one, its so simple but anyway some may find it interesting you are standing outside a 5x6m room, the room have one door and no windows or anykind of hole to have a look inside, inside the room there is a table with a table lamp on it, there is 3 buttons outside the room one is for the table lamp and the other 2 for something else not par...

Poem Riddle
1. Surrounded in jet black, and also surrounded in white light, 2. Received easily, yet impossible to be rid of, 3. Strikes fear into most, but relief in some, 4. I linger around battlefields, harvesting my special crop. These four clues all describe me. What am I? ...

Numerical Jigsaw Puzzle
Divvy up the following numbers into 10 different groups such that each group sums to 25: 1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3, 3,3,4,4,4,4,4,5,5,5,5,6,6,6,7,8,8, 8,9,9,9,10,13,14,15,20,21 ...

Probability Question
On average, how many times do you need to roll six dice together to see all six different numbers turn up within a single such group roll? can any1 solve this, and show working ? ...

And The Answer Is......
On the outside Im meshed, am I living? No. With a press of a button I am ready to go a dial will change me as easy as cake and I love to go into what Babbage did make What am I? Should be really easy, but I wanted to make my first (also pretty bad) topic! ...

Interesting Probability Puzzle
Alright, we've all seen the first couple of these, but the third one is kind of interesting. 1. A man has two children, the older of which is a son. What is the probability that he has two sons? 2. A man has two children, at least one of which is a son. What is the probability that he has two sons? 3. A man has two children, one of which is a son who was born on a Sunday. What is the probability ...

Inverting Permutations
suppose you have a list of length x: [a1,a2,a3,a4...ax] each item in the list is given its value by its position in the list you take the nth lexicographic permutation of that list to create a new list:[as,ay,az,ao...at] you then take the mth lexicographic permutation of the new list, creating a list identical to the original list. define m in terms of n and x. here's a code in python that wil...

Cat In The Rain
Just came across this site and thought i would add something.(wrote it as best as i could remember) One dark storm night, and old lady was knitting by the fire when she heard a strange noise outside. She went to her door and found a kitten at her doorstep drenched to the bone. She look on its leather collar and saw the cat had no name. She couldn't leave it outside so she brought it into the hou...

Sequences
can you guess the next number in the sequence? 1) 10, 11, 21, 101, 121, 201, 221, 301, 321, 421, ... 2) 1, 10, 11, 21, 110, 201, 311, 1020 ... 3) 1, 20, 111, 220, 401, 1100 ... Spoiler for hint all three sequences are in the same base. ...

Many Will Look And Many Will See
Many will look and many will see only one of the sides of me. Omitting the crime of looking right now, figure this out and you're very bright. What am I? ...

Now You See Me...
Here I sit in a row of my peers, No feeling, no life, no freedoms, no fears. Chosen in time of untimely scene, Plucked am I from my spot in between. I take off my hat, and prepare for the show. A good rub should do it, as most men will know. I spout off my magic, making brilliant the stage. When curtains is called, My life is not stayed. With a flick of a wrist, and not a word said, I leave fr...

The Mobius Strip
I have watched people trying to solve this problem mentally, and it's interesting to watch their eyes rolling as they try to imagine the twists and turns. A strip of paper 400mm long and 40mm wide is joined at the ends to form a loop, but before joining, a 180deg twist is applied to it. This forms what is called a Mobius loop, a flat object with only one surface. We can consider this to be one co...

Generating Numbers
Applying the steps below, you will generate a number, on the condition that every digit of a number produced in each step is different from its other digits. 1. Write down a number with one, two or three digits. 2. Delete at most three consecutive digits and in the places of the deleted digits place the square of the number formed by these digits. 3. For the number you get, repeat steps two and t...

Algorithm 3
Got this idea from riddles in other threads: You have N number of metallic spikes planted into the ground and all arrange in a circle with equal distances between each neighboring spikes (in other words a perfect polygon) You have a string with you that you need to pass around all the spikes creating a net that has every spike connected to every other spike with minimum number of repeated connect...

Inflation And Expansion
A car inner-tube (with no tyre around it) is inflated to "normal" size, and a measurement is taken of the diameter of the centre hole where the wheel would go. It is then inflated further. Does the diameter of the hole increase, decrease, or remain the same? ...

A Very Interesting Puzzle
The attached image shows the layout of streets in the centre of a small town, Midville, in which every line segment (e.g from A to B) is exactly 1 kilometer. The City Council has just resurfaced all of the streets and now the line down the middle of each street must be repainted. The truck used for this purpose is very inefficient as far as petrol consumption is concerned, and so the Council woul...

It Must Be......
Frozen in time..... what's the worst that could happen? Yet, I go on and on For many years...... Happy, Sad Good, Bad They are all the same But different in their own way You may not love me, But you keep me, anyway... harm me or not, you'll still pay the price..... ...

Polynomial Roots
Here's a puzzle I got in an email yesterday that took a bit of thinking to solve... good luck! Let P(x)=xn+cn−1xn−1+...+c2x2+c1x+c0, where each of the coefficients, ck, are integer. Prove that the roots of the equation P(x)=0 will either be irrational or integer. Spoiler for Hint Like nearly all simple proofs that involve irrational versus rational numbers, start by assuming tha...

Points & Lines In A Box II
If we place N points, no three of which are collinear, in the box {(x,y)|0≤x≤1 & 0≤y≤1}, then we connect every pair of these points with straight line segments, there may be some segments which cross other segments. Let F(N) be the minimum number of crossings for N such points. It's pretty easy to see that F(N)=0 for 2≤N≤4, and F(5)=1. Find F(N) for N=6,7,8,9, ...

A Journey For Treasure
In the time of the roman republic, a peddler and his wife started traveling toward Sicily in order to find a place to sell sandals, their craft. On the first of October, they came across an old woman with no shoes on. Of course, being astute businessmen, they tried to sell her some shoes. They were very generous in selling them, so the old woman told them a prophecy. Exactly one year, month, w...

Points & Lines In A Box
It is easy to find a set of 4 points in the box, {(x,y)|0≤x≤1 & 0≤y≤1}, such that, if every point is connected to every other point by a straight line segment, no two line segments cross each other. Can you exhibit a set of 5 or more such points? Here's an example using a set of 3 such points: (0,0), (0.5,1), (1,0). Here, the line segments form a triangle, and so, no two o...

If You Can Do It, You Are Really Smart
A professor was a guest lecturer at a logic course for senior executives of major oil companies. She selected six male participants for this demonstration. The professor placed fifteen 10 cent coins and fifteen 5 cent coins in six tin cups such that each cup contained the same number of coins but a different amount of money. She made six labels showing correctly how much money each cup held, but ...

The Fifth Son
Okay, Mr.Johnson has five sons. His first son's name is Alpha. Second is Beta. Third is Joseph. Fourth is Aaron. What is the name of his fifth son. ...

The Bus Of Mystery
The local bus driver told me that last week, his bus was almost full of people. After his final stop of the day, the bus was totally empty, but not a single person got off the bus. How is this possible? ...

Neighboring Digits
We have a number. All the digits of this number are different from one another and all the digits except the first and the last have a greater value than the mean of its neighbors (i.e. the digits immediately to the left and to the right). What can this number be at maximum? ...

Sum And Sum Of Two Squares Revisited With Proof
I recently posted a puzzle given to me by a friend that he got from his Dad many years ago. Once a couple of solutions were found, the thought was there may be many solutions. I discussed this with my friend and he felt that the reason another solution was found was because the solver had put an upper bound ond the range of possible numbers. This had the unintended consequence of creating the extr...

Cube Coding
See if you can decode the below image: Hints will be added later. ...

Cup Pyramid...
Not exactly pyramids, you can build a structure out of cups in 1 dimension: 2 dimensions: Or 3 dimensions: This is as far as we could perceive with our 3D view of the world, but in fact you can carry it out to 4 dimensions, 5, 6 and infinity dimensions, like this: 4 dimensions: 5 dimensions: 6 dimensions: Let h be the height of the biggest "part" of the structure (in all above ex...

Break It 2
This is a small expansion on the original Break it! puzzle: You have a 3 meter length stick which you need to break twice, first you break it at any point (equal probability for every point on the stick) then you take the right half and break that, what is the probability that you get two pieces which are equal to r bigger than 1 meter length? Another variation, you break it first then you break...

Newsworthy
Harsh, yearning for fulfillment. -3 or more. Red. Spark. Frenzied, uncensored. Break through. Zephyr, poisoning the breath. Help. ...

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