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?
6. 2 points

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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

## Walking, running, driving, waiting

I'll accept it but I was thinking more like ....
17. 1 point

## 20 RIDDLES TO TEST YOUR MATH, IQ AND THINKING SKILLS.

Didn't watch the video - Will take too much data (for me)! Please show us the answers after everyone has had a go at them!
18. 1 point

19. 1 point

## Senseless promotions? Or, the wisdom of the tea people

EDIT: For clarity, I use "number" to reference an individual digit. I use "sequence" to reference the string of numbers. EDIT2: Added spoiler tag.
20. 1 point

## Coin hunt

Fuzzy thoughts:
21. 1 point

## UN Mafia III

Hey guys, sorry I'm here. Didn't realize I could talk when I was trapped and then I'm having issues accessing the site on my phone. I'm on through Firefox now and it works better than Chrome I guess. I will catch up at lunch and see what I can contribute, hopefully before the night ends in case I was mercy/mod killed.
22. 1 point

23. 1 point

or
24. 1 point

## Can anyone help me find this type of logic questions?

Hi Jelly, and welcome to the Den. I searched on the Web a bit, and did not find puzzles of this type, but they may be out there. If anyone does find them, a link can be posted to this Forum: http://brainden.com/forum/forum/9-other-mind-boggling-stuff-on-web/
25. 1 point

## Foreign Speakers

A different kind of canine Middle Eastern Dairy Product
26. 1 point

## Crocodile Sophism

Well if the mother gussed that the crocodile was going to eat the child and she was wrong, then the crocodile would eat the child ,Therefor the statment would be true and the crocodile would have to give the child back to honor his word.So the mother would get her child back ether way.
27. 1 point

## Relatively prime

yeah I believe it is actually 6/pi2.
28. 1 point

## Reconstructing a Pentagon

I agree gavinksong. Sorry for not committing before. Initially I found your solution to be merely an alternative to the original. But after consideration, I think yours is better. I have switch to gavinksong's solution as it appears to be more robust. I am open to arguments for/against either TSLF or Gavin's or another better option if anyone has interest.
29. 1 point

30. 1 point

## k-man's kasino

To celebrate the Grand Opening of his new casino, k-man offered the first 1000 patrons the opportunity to win some pocket change by playing a game that carried the catchy phrase Flip while you're a-Head. Each patron paid \$100 to flip a coin multiple times, winning \$100 for every H (heads) that appeared, and stopping (without penalty) at the first appearnace of a T (tails.) What was k-man's expected cost for this gesture of good will? A coveted bonanova gold star for an answer from the The Book.
31. 1 point

## Segments on a line

Given 50 segments on the line. Prove that one of the following statements is valid: 1. Some 8 segments have a common point. 2. Some 8 segments do not intersect each other.
32. 1 point

## Polygons make a line

Using the interpretation of "crossing" as "having a common point with"...
33. 1 point

34. 1 point

35. 1 point

## Pecular Spectra

Three interstellar stations have observed a distant cluster of gas clouds known as RGB-9. The stations are positioned at right angle with each other. The photograph images captured by X,Y, & Z telescopes at the same instant are having exactly the same configurations (see below). Some of the gas clouds that are behind the other cloud emits a mixed spectrum.. How shall they construct the 3-D plot of the cluster?
36. 1 point

## Four-legged stool

Edit: This assumes that the legs of the stool form a square. Determining whether it applies if the legs are in any other orientation is left as an exercise for the reader.
37. 1 point

38. 1 point

## The "aha!" problems 8: Reflect on this

A ray of light encounters a pair of angled mirrors from the left, as shown, a distance d from one mirror and at an angle a from the other mirror. If angle a is exactly 22.5o, how close will the ray get to their intersection at point O before it eventually exits again to the left? The drawing may not be to scale.
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41. 1 point

## Bounce 'n Balance

If a guy from the 1st floor steps on one side of the beam balance and a guy from the 5th floor jumps on the other side, they would exchange positions due to conservation of energy. How many times should they use the beam balance in order to pair themselves on every floor?
42. 1 point

## Betting on red

Here's a variation on a previous puzzle that let you make multiple bets while choosing the color of the next card. I shuffle an ordinary deck of playing cards and then turn over the top card sequentially so that you can see it. At any time you may ask me to stop and place a \$1 bet that the next card to be exposed will be red. If you never ask me to stop, you will automatically bet on the last card. To summarize: You can bet on only one card. You don't get to choose the color. You must bet the card will be red. What is your best strategy? How much better than even can you do?
43. 1 point

## Food For Thought

44. 1 point

not describable by other words, because if you just used an adjetive technically you DESCRIBED it, so......???? go look up 'indescribable' in the dictionary. it says adjective: not able to be described. look up adjective: a word that describes"
45. 1 point

## Crossing the bridge

A group of four people has to cross a bridge. It is dark, and they have to light the path with a flashlight. No more than two people can cross the bridge simultaneously, and the group has only one flashlight. It takes different time for the people in the group to cross the bridge: Annie crosses the bridge in 1 minute, Bob crosses the bridge in 2 minutes, Caren crosses the bridge in 5 minutes, Dorothy crosses the bridge in 10 minutes. How can the group cross the bridge in 17 minutes?
46. 1 point

47. 1 point

## One Up Me

You can shoot the gun, but...add the bullets, first... ...noobs...
48. 1 point

just burn the card
49. 1 point

## Pears

THIS RIDDLE MAKES NO SENSE!
50. 1 point

## Baldyville

What if inhabitant 519 had a split end that broke off? Would that be exactly one hair or a partial hair?
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