Brain Teasers and Puzzles

Heya! I was browsing the net as usual and suddenly I was struck with a weird question about time travel. I don't know why my brain decided to pop this question all of a sudden when I wasn't even doing anything science related things. Anyways, my question follows: Vers.1: Let's say, today, I was playing a different kind of d&d and the dice had 100 sides. I rolled 25. After a week I found a time traveling car and decided to turn back to the moment where I rolled 25. This car also has a gimmick where it makes you only a spectator meaning that you can't interact with anything or change anything. Now, my question is if I can see myself rolling a number other t…

This is a word problem, I think. I know I'm doing something wrong along the lines of the bellboy's missing dollar but I don't know where I'm messing up. Could be my physics, or maybe even my gozintas. Can someone help me? Here 'tis: Latent Heat of Fusion ice stated in layman's terms says the following take any quantity of ice, I'll use an ice cube at exactly 0oC and apply exactly enough heat to melt it and you end up with water at 0C. All the energy goes into breaking the molecular bonds and no heat at all is imparted to the substance. Now, if you apply the exact same amount of energy to that 0C water the water will absorb enough heat to raise it 80C. With…

Cut a cube and create a 3D shape having one third of its volume with : (1) eight triangular surfaces (2) six triangular surfaces

Cut a Cube and rearrange into a Regular Pyramid with a Square Base and a Tetrahedron Triangular Pyramid with an equilateral Triangle as the base !

Prove that every Quadrilateral Area can be divided by cutting and joining into Four Identical Equal Shape/Area Pieces !

Dear everyone, I have some items in my possession which have some strange meaning to me and during the years, with much help from many people, I think have been able to identify only very small meaning of some of them but that is only an insignificant portion of all there is, therefore I will present you items one by one (scans).Most of the people I spoke to, including scientists, told me that they have mathematical and physical meaning so try to guess what it is/presents Item 1

Here is a cool logic puzzle fictional murder mystery book that was created by a friend to be used in a role play game world we are a part of. In it you must find out the four names of the killers plus the final 5th name of the leader. I am completely stuck. I think i am getting caught on the images and what to do there. If anyone has some downtime and likes this kind of logic stuff lmk if you can solve. I think I am at a loss. From my friend: "This book consists of a series of 4 different murders culminating in a final riddle to reveal the person behind it all. Each of the four murders have a different killer that you must solve before will be able to find the fifth …

Have the following hex codes, that appear in the following order. I've noticed that there are 54 items total, the first 27 and the latter 27 are the same just in a different order between the halves. I have the below columns split as the first 27 and then the next 27 are in the second column. I assume this is supposed to resolve into text but I've tried converting the hex codes into utf-8 or ascii and get mostly random or invalid characters. Not sure where to start with decrypting this, I assume it's important that the unique items get reused exactly once. also there were no # signs in front of the codes so I'm not sure if this relates to being color hex codes or not? Als…

Is it possible to conceive of, design and construct a vehicle that, powered only by the wind, can sustain speed in excess of that wind while travelling in the direction of that wind? I'm a new member so, if this teaser has been asked before, my apologies.

From a Stanford lecture on Fourier transform:

The riddle or not: A barber lives and works in a small town, he is the only barber in the town. The barber only ever cuts and shaves the hair of all the men who live in the town that never shave or cut their own hair. He never ever cuts and shaves the hair of all the men that do their own. Zeno's moving arrow paradox: Zeno suggested that the arrow never really moves because each of the smallest possible moments of its journey = 0 time and 0 distance so concluded that even every moment even to infinity only ever adds up to 0. This has since been proven a fallacy and as we all know in reality an arrow shot from a bow will have a journey of some distance over…

The whole puzzle is in the title. It took a friend of mine, in his own words, "3 pages of factoring (correcting and replacing)". It took me 6 lines. Take a challenge?

It's been some while since we had a weeend puzzle to chew on so here is a new one. You enter the bar and are offered a 1200 ml jug of beer on the condition that you divide the beer exactly into halves by pouring it into a number of jugs until you have exactly half in one of them. You are provided with two empty jugs of 800 and 500 ml capacity. None of the jugs have any markings to indicate volume. Other rules are that you may not discard any beer or use any further containers or weigh anything. What is the minimum number of pouring steps to achieve this and what are they ? Please put answers in a 'spoiler', available at the end of…

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I guess I'll post my question as a riddle? Not sure where I should have posted this. Feel free to move it elsewhere. Hi. I have a question for a novel I'm outlining. Question: So let's say that Kepler-22b is 31% land, 69% Ocean. (I'm saying this. Not reality) Then what is the land mass in sq miles of Kepler-22b? What is the ocean mass of Kepler-22b? What as the formula to get there? Data that I have found to work with: Earth has a radius of 3,958.8 miles Kepler-22b is 2.4 times bigger then Earth (Which I guess means Kepler-22b is way bigger then Earth. Like 36 times the mass of Earth, according to google? That sounds crazy to me.) Kepler-2…

Two friends A and B set out for a morning walk around the Building on the defined Walking Path starting from the same point. A will finish his walk when he completes 10 rounds. A walks twice as fast as B. If they walk in the opposite direction how many times they cross each other when A finishes his walk ? If they walk in the same direction how many times A overtakes B before he finishes his walk.

66 88 66 222 2 6 2 444 7777 hi I need help with this but I do not have much experience ... I found this forum by chance and saw some related post so I thought if someone could help me decode. And some kind of puzzle and had a morse code underneath it, I translated it to "martin cooper" he kind of created the phone...i got a tip it just said "hello" loss by any error I'm using the translator :)

Make 44 using once each 2, 11, 13, 17, 19, 101 with only + - x / ( ) as Operators.

The Brain Teaser here is about cutting a Perfect Cube [let's take the one with 10 Cms edge] into two equal parts and discussing about the CUT FACE or the newly created SURFACE of the Planar Cut. Obviously for the remnants to be equal and identical the CUT must pass through the CENTRE of the Cube which is a sufficient criteria. We are not bothered about the multi-cuts and their effects such as producung a perfect tetrahedron and four other equal pieces. Now we can see that this single cut can leave a CUT FACE of a Square exactly equal to one face of the Cube. Or can produce a CUT FACE of a Rectangle with one edge and one diagonal as its sides. What is …

You sit down at the chess table, you lay your pieces on the board, you start by setting up the black pieces. Then, you switch seats and set up the white. For some reason, you've always felt it was unfair that white always gets to move first. How can that be a rule? Why is it a rule? Nevermind. The games about to start. White moves first. It's a French open. Nothing too serious. It's always better to play black defensively anyway. You watch and react to the flow of the game until finally, on the 27th move, checkmate. You look over at your opponent, no one there. You look down at the board, white won. Black king wasn't able to get out of the castle before it was too late. …

Anyone know the answer to this? It might just be made-up to bait people but I was thinking Spoiler number 2

Hello, I have been given a puzzle to pass on to people who may be able to solve it. Here it is: It doesn’t matter where it comes from I’m just an intermediary… Perhaps someone here will be able to solve it? Unfortunately there is no financial reward for solving it And apparently the solution tells us something new about black holes But I don’t know what I am not a mathematician or a scientist so it means nothing to me

*** I work part-time as a substitute teacher, all grades, all subjects. I like to share fun Math, like Math Puzzles, with students when the opportunity arises. I found some really cool Math Puzzles which I shared with a good friend, but he disagrees with me regarding the correct answers. I know how to get the correct answer to this Math Puzzle, but I could use some assistance with trying to explain to my good friend where he is mistaken. Here is my friend's response to me: *** It could be this... 6 x 9 = 54 5 x 8 = 40 4 x 7 = 28 3 x Y = Z 2 x 5 = 10 -- But then the answer would NOT be following the GIVEN PATTERN and this puzzle would become like a woman…