Brain Teasers and Puzzles

Two identical twins- One always lies, other always tell the truth. What is that one question that you should ask to one of them to find out who is who?

Programmer needed, I believe that the VMS words are just letters that equal numbers which are not represented as a language. I’m in search of a programmer who can apply my cipher to the VMS corpus of words and correlate it to a database of an Old English Dictionary associated with Gematria numbers. The programmer would have to use another piece of code which checks for grammar. Also the programmer would have to gain access to every VMS vord and substitute my cipher to every letter of it. What’s needed? 1) Entire list of all the VMS vords 2) Old English Dictionary 3) Dictionary is associated with standard Ordinal English Gematria 4) A grammar checker 5) My C…

Hello everyone, Can anyone find what is the digit at the unit's place of the product 81x82x83x....x89, without actual multiplication?

Although I have a question, I've decided to post this in the Brain Teasers & Puzzles section. The infinite hotel paradox goes like this: We have a hotel with an inifinite amount of rooms filled with an infinite amount of guests. A new guest comes in to check in therefore we move each guest to the next room and are able to free room nr 1 to be occupied by the new guest - nothing changes, we still have an infinite number of room and an infinite number of guests. Same thing if a guest checks out...we move all the guests this time to the previous room and we end up with the same result - infinite number of guests and rooms. Nice classic paradox. My question is...it …

If you're a farmer and you are given 4 seeds which would have maximum yield when all these are at equal distance from one another, how would you plant it?

Hello everyone, I have got here the following series - 0,4,18,48,100,? So what's the next number ?

Hello I got an interesting puzzle here. ;-) A short man takes three steps to a tall man's two steps. They both start out on the left foot. How many steps do they have to take before they are both stepping out on the right foot together ?

Suppose there is a series as: [math] a, a+b^2, a+b^2+c^3, a+b^2+c^3+d^4,... [/math] where a is constant and- b=a+k1 c=b+k2 d=c+k3 where- k2=k1+m k3=k2+m Can anyone find the formula to get the nth term of the series?

~LL>~L L=L ~L*L=0 0>~L Then what if anything can ~L be equaled to?

You are in a dark room with at least 5 black socks and at least 7 white socks, how many socks must you retrieve to ensure you have a matching pair when you exit the room? There are only white and black socks in the room.

You have 3 boxes. 1 box contains nails, 1 contains screws and 1 contains both. All three boxes have the wrong labels. You can open boxes and remove items from them but you cannot look in the boxes. How many boxes would you need to open and how many items would you need to remove to figure out how to label them correctly? The boxes are labeled "nails", "screws", "nails and screws".

George likes to play with marbles. He has got a jar full of marbles of different colours. One day, he started to pick the marbles out of the jar. In the first picking he took away 1 marble, in the second picking he took out 2 marbles, in the third he took out 3 marbles from the jar - each time picking up as many marbles as the number of picking. He found that after fifth and seventh picking, the number of marbles that were left in the jar was a perfect square. Now, can you find the number of marbles that was in the jar at the beginning?

Suppose a glass tumbler contains a certain number of bacteria. A scientist found that the number of bacteria doubles itself after every one second by asexual reproduction (completely hypothetical). He observed that after one minute the glass was full of bacteria. Can anyone tell when was the glass half-full ?

Hi, Can anybody make 1000 by using sixteen 4s ??

Hi, Can anybody find two numbers such that the difference between their squares is a cube and the difference between their cubes is a square ? :-)

Hi, Can anyone use five 3s to get 31 ?

Alice and the Red Queen travel across the very large Chessboard. They skim together from Square to Square without returning to the same Square. Biginning on a Square, both of them always move faster and farther than the previous trip and always land on the Square Centres..How many Squares have they visited?

I know the answer but i'd like you try and figure it out ?

A cylindrical glass has water half its height Some say it's half full, while some say it's half empty But if Clair the liar mostly tell what's not right Will she say "it is full" or she'll say "it is empty"?

The std. 4ft x 8ft ga.#16 G.I. sheet is to be fabricated (cut,bend,weld) into a large water tank. If the design is an open top box..what is the best capacity ?

I only got it after a second hint & honestly never met a person who solved it without any hints. Can you solve it without one?

Hey guys, Check out this video with three challenging brain teasers. Comment below on how many you got correct!

What is the least total length of the track that can be traversed by the mouse to go from hole to hole? The pool table is 2 x 1 meter.

Prove this- 0/0=2

Only using: ! ; ( ; ) ; / and digits: 4 ; 5 Can you make an equations to get result = 2 p/s: we have 45/5 = 9 4!=24 5/4=1.25 Find more quiz like this here! Challenge your mind with the HARDEST QUIZ in MATH ad removed