BrainDen.com - Brain Teasers

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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?
6. 2 points

7. 2 points

8. 2 points

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

Logic Puzzle with 26 Variables

What is the answer of (x-a)(x-b)...(x-z)? The solution is contained in the video below https://youtu.be/CnHBE4SbRRs
17. 1 point

Forgotten District II Mafia

Can I be the one to own you Molly? Or be owned by you? Please
18. 1 point

UN Mafia III

Taps watch. Oops. RIP MikeD. Would love to hear from maurice.
19. 1 point

Unseen Highness

Brainy Binary gave me the hint, thanks!
20. 1 point

a new IQ test question

I'll go for it again:
21. 1 point

Maths Teaser

If we assume that all 1000 bottles might be used ... one approach
22. 1 point

Half-balls

Assuming that all heavy halves are identical (and therefore all light halves are identical too), so we can pair any heavy half with any light half to create a sphere.
23. 1 point

24. 1 point

25. 1 point

26. 1 point

Decrypt it and find out what's next in the sequence!

What should stand in the place of the question mark? Here's a picture:
27. 1 point

28. 1 point

Upside Down Cake

[spoiler='Demonstration for irrational case']Amazingly, everything is on the Web. This guy used Mathematica to simulate the problem. For 185 degrees, it takes 4 cuts. For 1 radian (an irrational number) it takes 84 cuts. Check it out.
29. 1 point

Hats on a death row!! One of my favorites puzzles!

THE last person can see 19 hats in front of him. 19 is an odd number. So it is the sum of an even and an odd number. Let us assume that there are 12 black and 7 red hats. The Last man will say the color of the hat of which there are even numbers, in this case black. The person in front of him can count the number hats he sees. CASE 1 - He is wearing a red hat. So he sees 12 black hats and 6 red hats. Since he knows that black hats are in even numbers. He discovers that he's wearing a red hat. CASE 2_ HE is wearing a black hat. So he sees 11 black and 7 red hats. The last guy has told that black hats are in even numbers. So he discovers that he is wearing a black hat. Similarly the people in front can find out the color of their hat and thus can save themselves. The last man can either be wearing a red or a black hat. So that is 2 possibilities and he says one color. So he has a 50% chance to live. THANK YOU
30. 1 point

Fully Empty

31. 1 point

Just brute force. Ah, ok. Then it may be of some value for me to continue with my approach to closure, if only to check whether I get the same results.. Matches with witzar's post..
32. 1 point

A righteous life tragically and all too soon ended, Besot with wishes unfulfilled and regrets untended, Onto this realm must my tortured soul hold, Until answers are found and my tale at last told. Time which now seems broken and fleeting, May be later found to be to the answer leading, Endlessly cycled to the phantomâ€™s weeping.
33. 1 point

Total number of equilateral triangles

* * * * * * * * * * * * * * * * The 16 points above lie in a plane on an equilateral triangular lattice. Certain sets of three points of the figure correspond to the vertices of equilateral triangles. Suppose you were to form all of the equilateral triangles possible, such that, for any given equilateral triangle, it must have its three vertices coincide with three of the 16 points. How many total equilateral triangles can be formed this way in the figure?
34. 1 point

35. 1 point

36. 1 point

I'm Back :)

Hey guys! I've missed this place. I was heartbroken when the forums got destroyed, but I'm glad to see it's survived. What I miss?
37. 1 point

38. 1 point

Bake it

If the pieces of cake must have the same size and shape, then I get the feeling this isn't one of those questions of the "one person cuts and another chooses" variety. It's asking how a certain number of slices can result in equally shaped pieces if the guests can cut with absolute precision.
39. 1 point

40. 1 point

41. 1 point

Food For Thought

Getting things started, for Packs quite a wallop, when one really sings Motions to give the shaft, certain body rings I'll have to take it up a notch to make a decent try at the others.
42. 1 point

43. 1 point

One Up Me

And it was so...Bessie the cow vowed never again to enter that chamber of horrors so innocently named "McDonald's."
44. 1 point

45. 1 point

June 2013 ROM - Word-Riddle-of-the-Month - I'm not a siren

Bloodthirsty tongues, coated sweet Welcoming mats on the floors Lost in their dream, thus I greet Then wake with a crack at the boards Metal and wood, right and left Crashing, they pray to take flight Fully renounce plan of theft For life or for death clinging tight
46. 1 point

Fowl Play

Okay, I've been stuck for a while but then I realized I may be way over-thinking some of these:
47. 1 point

One Up Me

out of the frying pan and-------onto the automatic waterfall glazing machine!
48. 1 point

One Up Me

Whoa!! Potential bacon in earshot!
49. 1 point

The Bible

...He took two of each animal, mate. I dunno WHAT you're smoking.
50. 1 point

Magic Moving Images - video

How does it work? I guess the lines in front hide the lines behind, showing a slightly different picture each time giving the illusion of movement.
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