BrainDen.com - Brain Teasers

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## Popular Content

Showing content with the highest reputation since 07/16/13 in all areas

1. 2 points

## A Simple Riddle

In our circles you may find A laugh, a wink, a grin But pressure us we'll likely snap And send away our kin. We don't do much, we go to pot Such simple ones are we But with your hand we take command Or from you we will flee.
2. 2 points

## Folding paper

Agree. When I hit the send button, I realized my thinking was too simple. But instead of deleting my post (moderator privilege) I left it to take its licks.
3. 2 points

## Simulating an n-sided die with two coins

Say we want to simulate an N sided die.
4. 2 points

5. 2 points

## Upside Down Cake

(This puzzle is from a blog called By Way Of Contradiction.) Imagine you have a circular cake, that is frosted on the top. You cut a d degree slice out of it, and then put it back, but rotated so that it is upside down. Now, d degrees of the cake have frosting on the bottom, while 360 minus d degrees have frosting on the top. Rotate the cake d degrees, take the next slice, and put it upside down. Now, assuming the d is less than 180, 2d degrees of the cake will have frosting on the bottom. If d is 60 degrees, then after you repeat this procedure, flipping a single slice and rotating 6 times, all the frosting will be on the bottom. If you repeat the procedure 12 times, all of the frosting will be back on the top of the cake. For what values of d does the cake eventually get back to having all the frosting on the top?
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## I swear:

I swear: 1) To strangle the next person who uses 'suicide' as a verb. 2) That if I offended or hurt you in any way, I didn't mean it. 3) That I'll stop procrastinating. Tomorrow. Add whatever you swear.
9. 2 points

## Human origin" according to my own theory"

Personally, the original reason I believed in God is that an adult told me he existed when I was little and, being little, I took their word. But over time, I've listened to people talk about their experiences with God and seen it with others. I think I've seen Him get me through a lot of stuff the past few years that I don't think I'd have been able to make it through alone. You could say that I got through them because I worked hard, or just because believing in a higher power has some effect psychologically, or that there were coincidences involved, but when I put it all together, those reasons just don't work for me. But if I had to give just one reason that I believe God is real, it would be that He told me so. Audibly.
10. 2 points

11. 2 points

## Crazy People

eq ( 1 ) Study = not failed eq. ( 2 ) not study = failed add eq ( 1 ) & ( 2 ) study + not study = fail + not fail study ( 1 + not ) = fail ( 1 + not ) study = fail Then why should we study??
12. 2 points

## Blonde Jokes

this one is pretty cute! Blonde v.s. Lawyer a lawyer sitting on a plane next to a Blonde want to pass some time and turns to her and says, "how about a trivia game, if i ask you a question and you get it right I'll pay you 10 dollars, and if you get it wrong you pay me 1 dollar. then you ask me a question, with the same conditions." blonde says, "no thanks, I'm reading a book." the lawyer says, "okay how about this, 20 dollars for getting right for you, and 20 dollars for getting wrong for me." the blonde rolls her eyes and says fine. the lawyer asks, "whats the distance from the earth to the sun?" the blonde hands him a dollar. then the blonde asks him, "what goes uphill with 3 legs and down hill with 4?" the lawyer blinks for a second and says " i have no idea, i guess you win that round." then hands her 20. "okay my turn again, i am curious, what does go up hill with three legs and down hill with 4?" the blonde hands him another dollar.
13. 2 points

## One Up Me

What happens in quantum statistical thermodynamics stays in quantum statistical thermodynamics...b/c no one else cares.
14. 2 points

## One Up Me

Out of the frying pan and on to the floor. Back into the frying pan, let hope none of the guests saw.
15. 2 points

## Crocodile Sophism

I would think that the only way to make ANY sense of the situation is for the woman to repeat back to the croc EXACTLY what he said to HER: "If I guess right, you'll give my baby back, if I dont, you'll eat him. That's what you'll do to him." He'd have to return the baby, because she's CORRECT NO MATTER WHAT. Eh? hehehe
16. 1 point

LEGEND
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18. 1 point

## Video Game Logic

Another factor to possibly consider...
19. 1 point

## Worth the Weight

4 light ones/48
20. 1 point

## Forgotten District II Mafia

Edit - double post, so I thought I'd take this time to post a dancing monkey gif. Enjoy.
21. 1 point

## Signups for Forgotten District II Mafia

@MissKitten Tagging does not work on mobile and quoting is hard on mobile as well. But other than that, on a PC, one can copy-paste colors and not bother with quoting the roster altogether. Which is cool. At least from a host's PoV.
22. 1 point

## Binary lock

Real life: I bought (very cheep) a 256MB extension card for a 80286. There were 8 dip switches and no manual. I do not know how many times each switch can be flipped, in any case, it is better to minimize the manipulation. Look https://en.wikipedia.org/wiki/Gray_code
23. 1 point

## 5x5 table with unique properties

Example : (2,2) cell (red) is 3, so it is surrounded by 3 unique numbers (1,2 and 3) (4,4) cell (blue) is 4, so it is surrounded by 4 unique numbers (1,2, 3 and 4) The Question 3 . . . . . . . . 2 . . . . . 2 . . . . . . 3 . . Fill in the blanks so the table has the same unique properties. I think I have it:
24. 1 point

Description:
25. 1 point

SNARL
26. 1 point

## Re-ROLLO

@marksmanjay you're missing GOTHS - 1 and a duplicate MATES - 2 - your points, not mine P.S. Cool "@" works /me slaps mo around with a large trout P.P.S IRC does not work
27. 1 point

28. 1 point

## Connect the Dots

o--------1mile--------o--------1mile--------o | |1mile | | o--------1mile--------o--------1mile--------o | |1mile | | o--------1mile--------o--------1mile--------o Build a road system that access all the 9 towns shown on the map. How long is the total length of shortest pavement that can be constructed?
29. 1 point

West Indies
30. 1 point

## IQ test question

Here is my best reasoning:
31. 1 point

## IQ test question

Yes, I think the duplicated answers were probably just a mistake. This is the other question I am having trouble with:
32. 1 point

## Random bullets

I hope I got it:
33. 1 point

## Image puzzles

The first image No idea what the other 2 images mean.
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36. 1 point

## Empty a peg and marry a Princess (difficult)

There were two questions posed. 1) Can you clear out a peg? 2) How would you do it? A little surprisingly, I can answer the second question but not the first.
37. 1 point

## Random points on x-axis

Asking about probabilities makes no sense unless there is a probability distribution. Unfortunately there is no reasonable distribution on R+. But an obvious distribution exists on interval [0,x], where x is any positive real number. One thing we can do in such case is to try to solve the problem for [0,x] and then see if the solution has a limit when we go with x to infinity. With this approach it's obvious that the probability we look for equals 0.5 for every x, so obviously it's limit is also 0.5 when x goes to infinity.
38. 1 point

## Weighing machines

Ah the editor did not let me change the formatting while editing. In the previous post, I copy pasted from excel. While editing it showed things fine but the final result was all messed up as you can see in the previous post. This should look better Otherwise Weigh 2 4 6 8 10 12 It should weigh 42 If it weighs other than 42, refer to weighings "B" below - max 3 more weighings needed Otherwise Weigh 1 2 11 12 It should weigh 26 If it weighs other than 42, refer to weighings "C" below Otherwise Weigh 3 4 10 It should weigh 17 If it weighs 17, then eggs 7 &9 are swapped If it weighs (-2) 15, then eggs 8 & 10 are swapped Otherwise, it weighs 19 (+2) and the possibilites are 3&5 or 4&6 are swapped Weigh 3 If it weighs 5, then eggs 3 & 5 are swapped Otherwise eggs 4 & 6 are swapped
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43. 1 point

## Chuck Norris Jokes

Chuck Norris' keyboard has two buttons: 0 and 1 Chuck Norris' computer can solve the halting problem Chuck Norris has counted to aleph one. Twice. Chuck Norris can count the real numbers Chuck Norris knows all of pi Chuck Norris's computer never crashes because it is afraid to Chuck Norris doesn't need antivirus, viruses are afraid to enter his computer Chuck Norris can type sudo rm -rf / --no-preserve-root without crashing his computer When Chuck Norris uses sudo, there are less privileges Chuck Norris can delete system32 without his computer crashing Chuck Norris's computer can execute an infinite loop in 2 seconds Chuck Norris catch 'em all, shiny Chuck Norris can go back in time, kill his grandfather, and still live Chuck Norris can run Windows fast Chuck Norris can see the source code of all binaries Chuck Norris can break a one time pad Chuck Norris can decrypt RSA with a public key Bill Gates, Steve Jobs, and Linus Torvalds live in constant fear that Chuck Norris' computer will crash Chuck Norris can construct a set of all sets that don't contain themselves Global Warming exists because Chuck Norris turned the sun up
44. 1 point

## Food For Thought

[spoiler='A one time dodge, yet on target I should stay Flits back and forth, then stunningly falls prey'] Dart Got the wrong Dodge
45. 1 point

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47. 1 point

## One Up Me

That was so unexpected, I didn't know that a giraffe could play the piccolo, let alone doing it underwater
48. 1 point

## I'm Assassin, But I promise to never kill anyone of you ^_^

Thanks for the suggestion. If anybody could draw some quality vector graphics symbolizing BrainDen (eg. including taser) then I will consider putting it on 404 page
49. 1 point

## Ways to Annoy your Roommate

take pictures of your roommate while they sleep, and then slowly put them in her school books, adding more and more with each day. while shes at classes, sign onto her computer and leave it on porn or some weird image. speak about yourself in 3rd person narrate everything you do.
50. 1 point