Brain Teasers and Puzzles

If it takes twice as long for my BMW m-5 to pass your Corvette after it first overtakes it as it takes the the 2 cars to pass when going in the opposite directions, How many times faster is my car than yours? {1} guess

Hiya This might be of interest to you; I've built this really fun little brain testing application for a science project for my course. It tests for reaction time, and memory(more precisely backward digit span) It only takes a few minutes to complete, and at the end you are given your 'percentile', that is how well you have done compared to others. Its available from here: http://whitershores.com/braintestg/ - it would really help out if some of you could do it. You could post your percentiles and results on this thread! Thanks! Martin

Well, the title is quite self-explanatory. So, what are your favorite logic puzzles and why? (I'm running short and need new ones!) My favorite so far is probably the blue-eyed islanders puzzle. It took me long enough to solve it, but I managed to do so without cheating. I like puzzles that seem counter-intuitive at first. So here's a version of the puzzle:

I correspond with danger, but I won't any longer if you remove a stem I will become stronger What am I?

Thought I might share another favorite from last year's CiSRA puzzle comp. This one is a little easier than the last one I posted here a while back, so I expect some answers (imatfaal and Phi, I'm looking at you both). The puzzle is called 'Togetherness'. Colloquially, non-main characters of an MMORPG player Silver Backside in Britain Strait separating Russia and Alaska Near; beside; through the means of Hardened skin, such as found on the soles of the habitually shoeless Metal currency Unchanging A table for reading or writing on Ran away from danger A rood screen, or Australian jelly-like confection Misplace something, or come last in a competit…

3 men enter a hotel while the hotel manager is away. They read that a room costs $30, so they leave $30 upon the desk,get the key and enter their room for a good night's sleep. Meanwhile the hotel manager comes back, sees the 30 dollars upon the desk, and tells the bell-boy that the room is no longer $30 dollars but now only $25. He then gives the bell-boy 5 single $1 dollar bills and instructs the bell-boy to refund the $5 to the men. Upon going to the men's room the bell-boy thinks; hmm?, "No way can 3 men evenly divide 5 $1 bills." So, he decides to "help" and pockets $2 for himself. He then knocks upon the men's door and gives them each $1. Now here is the …

1) Joe and John were in the audience. the night the singer made his debut on the stage. 2) Both Harry and the writer have sat for portraits by the painter. 3) The writer, whose biography of Rose was a best -seller, is planning to write a biography of Joe 4) Joe has never heard of John. _____So_____? What is each person's artistic field? This is worth 2 green buttons for the first one to answer ! Best of lucK↔♣

This is a variation of the puzzle discussed in another thread http://www.sciencefo...rs-and-puzzles/. Some of this is taken from http://www.xkcd.com/blue_eyes.html, edited for this variation. A group of people with blue or brown eyes color live on an island. There are some unknown number N of blue. They are all perfect logicians -- if a conclusion can be logically deduced, they will do it instantly. No one knows the color of their eyes. Every morning, a ferry stops at the island. Any islanders who had figured out the color of their own eyes the previous day must leave the island on that ferry, and the rest stay. Everyone can see everyone else at all times and k…

Hi been trying to solve these numbers to figure out the true coordinates to a cahe,,, please help me 66 666 777 8 44 333 666 88 777 333 444 888 33 3 33 4 777 33 33 7777 333 444 888 33 7777 33 888 33 66 7 666 444 66 8 33 444 4 44 8 8 44 777 33 33 33 444 4 44 8 6 444 66 88 8 33 7777 22 999 9 33 7777 8 9999 33 777 666 7777 444 99 7777 444 99 3 33 4 777 33 33 7777 333 444 888 33 333 666 88 777 7 666 444 66 8 333 666 88 777 8 9 666 33 444 4 44 8 6 444 66 88 8 33 7777 thanks in advace

The following seven questions can be answered with a single word? Only 5% of a Stanford University graduating class got it right. 1. The word itself has seven letters.... 2. It Preceded God.... 3. It is greater than God.... 4. It is more Evil than the devil.... 5. All poor people have it.... 6. Wealthy people need it.... 7. If you eat it, you will die....

Black on the outside, yet red and thin; just lift up your leg and poke it in???

A bus driver was heading down a street in Colorado. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any trafic laws. Why not? Good Luck [i Like Turtles]

This is an old puzzle, but if you haven't seen it before it should make you think. You stand before two identical doors. On door leads to a long and rewarding life, the other door leads to sudden death. Before each door is a guardian who, if you ask him the correct question will tell you which door to take. However one guardian always lies and the other always tells the truth. You don't know which one lies. You are only allowed one question. You walk up to a guardian and ask him the one question you are allowed and he tells you which door to take. What is your question?

One snowy night, Sherlock Holmes was in his house sitting by a fire. All of a sudden a snowball came crashing through his window, breaking it. Holmes got up and looked out the window just in time to see three neighborhood kids who were brothers run around a corner. Their names were John Crimson, Mark Crimson and Paul Crimson. The next day Holmes got a note on his door that read “? Crimson. He broke your window.” Which of the three Crimson brothers should Sherlock Holmes question about the incident?

Hello Folks. I'm an electronics specialist but not in the field of RF / emitted energy and I have a question for those who might have more intimate knowledge. Using a common microwave oven as an example: The oven operates at 2.45 ghz with a wavelength of approx. 122mm. The metal mesh / screen inside the door allows sight into the chamber but disallows microwaves from escaping because the holes in the screen are too small for the microwaves to propagate through (roughly 1 to 1.5mm openings) Now let's move to Terahertz radiation with wavelengths ranging from 0.1mm to 1.0mm. What size opening would disallow these waves to pass? I would expect a copper mes…

A ball A is placed on a ramp of 48 degrees. What max. height F and distance C will reach the ball, excluding any friction? The ball is 3 kg weight, 20 cm in diameter. Note: this is not homework.

I keep going wrong on a puzzle and I am not sure why. The puzzle is by H.E. Dudeney. Obviously I am missing something but I don't know what it is. I've found the answer online, but having trouble with the process. Here is the puzzle: AT A CATTLE MARKET. Three countrymen met at a cattle market. "Look here," said Hodge to Jakes, "I'll give you six of my pigs for one of your horses, and then you'll have twice as many animals here as I've got." "If that's your way of doing business," said Durrant to Hodge, "I'll give you fourteen of my sheep for a horse, and then you'll have three times as many animals as I." "Well, I'll go better than that," said Jakes to D…

Four friends A, B, C and D are buying a car together. They agree that everyone should have one of the first four rides are all alone. But the following mandatory conditions apply: 1. If D is allowed to get on the first trip, so would C have the third trip. 2. If A or D, will have the second trip, so would C have the first trip. 3. If and only if A receives the third trip, would B want to have the second trip. 4. Will D get the third trip, A wants the second trip. 5. Will D get the last trip would C have the third and A the first. In what possible orders should they drive the car the four first trips so everyone is happy? Are there multiple so…

Use as many factors, and find the function of effects. Scientific method, you may find some variables unrelated. who ever can express the most functions, and use them in equation wins. analyzing system , function of learning 1.determine energy loss. 2. function of generating automatic effect. 3.watts per square meters function of change part of energy radiating factor 4 centripetal force watts per square meter 5. Prime mover generating centrifugal force 6,. poynting vector 7. output centrifugal net force. 8. plume waving, is releasing energy, waving the fan from a closed system. 9. automatic generating force, Energy of the gen…

My wife made brownies in an 11x13 in. rectangular pan. Not knowing that she had to deliver exactly half the pan of brownies to each of two different bake sales, I cut out a 1" x 3" rectangular brownie for myself, not along any edge of the pan, but sort of near the corner of the pan, and the edges of my cut were not parallel to the edges of the pan. I don't wish to suffer my wife's anger. How can she make one cut to divide the brownies exactly in half? (two possible answers (that I know of)).

My senior year in high school, I discovered a way to manipulate exponential functions to produce any sequence of numbers I desired. The challenge I am setting forth asks for the exponential function that produces the sequence: Edit: {{1,1}, {2,2}, {3,3}, {4,4}, {5,5}} That is, when [math]x[/math] is equal to one, [math]y[/math] is equal to one and so forth up to {5, 5}. {1, 2, 3, 4, 5} Such that: [math]F(1)=1[/math] [math]F(2)=2[/math] [math]F(3)=3[/math] [math]F(4)=4[/math] [math]F(5)=5[/math] The answer I am looking for only uses exponential functions of the form [math]a^{f(x)} \, b^{g(x)} \, c^{h(x)} \text{etc...}[/math] You are only allowed to u…

There are 8 people (Father, Mother, Thief, Policeman, 2 Sons, 2 Daughters) trying to cross a river by using a raft. Only the adults (excluding the thief) know how to operate the raft. A total of only 2 people are allowed on the raft at any given moment. The raft must travel back and forth across the river in order to pick up all of the people. Rules: You have the following people trying to cross a river: Father The father cannot stay with any of the daughters, without their Mother's presence. Mother The Mother cannot stay with any of the sons, without their Father's presence. Thief The thief cannot stay with any family member, if the policeman is not the…

I'm not sure about who gave me this, but I've never seen it solved. Maybe you guys have, so here it goes: Connect a line from each of the three squares to each of the three circles (nine lines in all) without crossing or going "under" or "above" a line. I believe the original brain teaser was phrased "Three houses need a gas line, water line, and electricity line, and all must be on the same plane underground." You'd be best not to try and solve it; I did, and I can't find any solution. If there is one, you either know it or you don't. But go ahead and try if you think you can.

Here's a common push paddle handle for doors. I see them everywhere. Why are they made of aluminum?

You are given 6 matches of equal length. You must make 4 equilateral triangles with side length equal to match length.