Brain Teasers and Puzzles

Can anyone spot the error in this fallacy <prepared>a + b = t <prepared>(a + B )(a - B ) = t(a - B ) <prepared>a^2 - b^2 = ta - tb <prepared>a^2 - ta = b^2 - tb <prepared>a^2 - ta + (t^2)/4 = b^2 - tb + (t^2)/4 <prepared>(a - t/2)^2 = (b - t/2)^2 <prepared>a - t/2 = b - t/2 <prepared>a = b Therefore all numbers are the same!

This poser is'nt mine, but I love it for ingenuity, and hence wish to share it here. I am attaching the problem as a word document. Enjoy the challenge. expression.doc

This is the Puzzle given by Company Recruitment team to recruit one of their Deputy CEO and the time given is 15 min... (Maximum) and the minimum time is..... Depends upon the person's IQ... Find the attachment below Let me know how much time you have taken to solve it.... brain teaser.zip

ok, I'm working on a puzzle and I need help. Forever in the FORTRESS and never to LEAVE, Lies a dark SECRET; how shadows DECEIVE. Do not be STRAYED by those in AUTHORITY. Do not ask WHO or WHERE, let's get some CLARITY. The question is WHY but it's not your CONCERN, If the answer, without sacrifice, you expect to learn.

Stupid, but still interests me I define that a number is 'used' if at least once in history at least one human being ever used it in any way (write, read, tell or even think of), the question is 'what is the order of magnitude of the smallest never-used natural number'? Note1: numbers that are never used as numbers, but instead as array of digits, are not spent and are considered unused. For example, telephone numbers. Note2: numbers used inside machines (computers) during computation procedures are not spent (except if a human being reviewed the process and noticed them). Note3: just a brief look at a paper sheet full of numbers will not spend them all. To spe…

Brad stared through the dirty soot-smeared window on the 22nd floor of the office tower. Overcome with depression he slid the window open and jumped through it. It was a sheer drop outside the building to the ground. Miraculously after he landed he was completely unhurt. Since there was nothing to cushion his fall or slow his descent, how could he have survived the fall?

I find myself unable to solve this cryptogram. I think it uses letter substitution, but maybe not. I must admit that I am slightly conflicted about asking for help, since I generally like to solve things on my own, so if it is not too much to ask, if someone solves it, perhaps they could give me some clues as opposed to the full answer? Many thanks in advance. The cryptext is as follows: "JFBULBY, EHO DQPHE KBQPLYO!" ULR EHOBO L SLR YQRSLMOY? ZFE EHFCPH EHO RFDYQOB AZOU RFSOFZO HLY KDCZYOBOY. EHOQBR ZFE EF SLAO BOTDM, EHOQBR ZFE EF BOLRFZ UHM, EHOQBR KCE EF YF LZY YQO. QZEF EHO NLDDOM FJ YOLEH. BFYO EHO RQW HCZYBOY. Just below this cryptext is the foll…

Hi everyone, This one is not very difficult, but I like it (I'm a Filipino, not a Russian ) Anyway, this is one of the (in)famous Microsoft's interview brain teasers that I think is actually quite good for an interview (assuming that the interviewee is expected to know the basics of logic and probability theory): Interviewer suggest to play imaginary Russian Roulette with you. Interviewer takes an imaginary revolver gun with 6 empty chambers, and loads 2 adjacent chambers with bullets. Interviewer has the first turn: rolls the cylinder, puts it to his head, and pulls the trigger... no shot. The lucky interviewer passes the gun to you and gives …

We know that at the time, the constant for a yard was the length from the King of Englands nose to the tip of his fingers. What constant is the basis for the meter?

The Work Instruction sez: What's the weight of the part?

This equation was solved by great mathematician Ramanujan. It's your turn to solve this equation: √X + Y = 7 X + √Y = 11 Solve it.. prove it...

A research team proceeded towards the apex of a natural geographic protuberance, the purpose of the expedition being the procurement of a sample of fluid hydride of oxygen in a large vessel, the exact size of which was unspecified. One member of the team precipitiously descended, sustaining severe damage to the upper cranial portion of his anatomical structure; subsequently the second member of the team performed a self rotational translation oriented in the same direction taken by the first member. Pick your brains!

For this problem, please ignore the fact that babies are not 50-50 boys-girls. Just assume that half of all babies are boys, the other half girls. A starter question first. You meet two old friends. One says "I have two children. The older one is a boy". The other says "I have two children, too, and at least one of them is a boy." For each friend, what is the probability that both of their children are boys? Hint: The probabilities are different. Now a third old friend joins up with you and says "I also have two children. One is a boy who was born on a Tuesday." What is the probability that both of this third friend's children are boys?

On Love I sit, on Love I stand, and Love I hold in my right hand. Love I see in yon green tree, yet poor Love cannot see me.

What's black on the outside, red on the in, just lift up a leg and poke it in???

I have gone up upon the ladder with my foot on Orion and my arm uplifted I summon a thousand, and the sun-folk come to me bowing

Puzzle: Just find out the thing.. wht is it? " Whats is it, which comes once in an year; twice in 6 months; thrice in a week; & 4 times in a day..? "

This is easily one of my favourite riddles as the answer is quite obvious and doesnt require the agonising contortion of your brain cells to work it out. I am sure some of you have seen it before, but if not, lets test some of you I turn polar bears white, and I will make you cry. I make guys have to pee, and girls comb their hair. I make celebrities look stupid, and normal people look like celebrities. I turn pancakes brown, and make your champagne bubble. If you squeeze me, I'll pop. If you look at me, you'll pop. What am I?

Hi all, a local magician/illusionist/mentalist in my country made a prediction about 2010 FIFA World Cup Winner. He made the prediction while he's isolated for 12 hours inside a dome made of ice build on a ice-skating rink. After he got out of the dome, he put the prediction inside a box with locks, witnessed by legal representatives and of course the audience. Then he hung the box outdoor about 50 metres high so everyone can see that no one can alter what's inside. He's going to open the box and reveal the prediction after the World Cup Final on July 11th match. In the meanwhile, he tweeted a cryptogram that he claims to be a country's name of the World Cup winner and he…

I have been attempting this very difficult codebreaker problem for the past few weeks and can get no further than finding the answer for just the first digit of the code. Can anyone on here help? This was set as a holiday project for University Engineering Students and as far as I know , nobody managed to solve it ! ========================================================== A master criminal has broken into a jeweller`s strong room which has the walls lined with several thousand storage boxes protected by individual four digit combination lock codes.. Many ( but not all ) of the storage boxes contains small bags of precious stones (diamonds etc.) so the …

Answer this question as best as you can with plenty of explanation. your response will give significant insight into how you think.

What elements of carpenters' logic do you need to demonstrate the Pythogorean relation of any right triangle, that: [math]a^2+b^2=c^2[/math]?

Im shure everyone knows this: If you get an orange,Peel off about 3" of skin. Sweese the outside of the skin against and open flame,or lighter and you will have ignition. The spray from the orange will ignight for a second

What can you do with a lighter and an orange? This is a simple one

Trivea Question" Whats the fastest thing in the entire universe that we know of??????????? I will answer later.