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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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.
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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

## Can't see the trick?

Don't you know what to look for in the illusions published on my page (eg. Visual Illusions or Optical Illusions)? Attach here the one you would like know the trick for and I will give you a hint.
17. 1 point

## DUCK

Son, father and grandfather - three only
18. 1 point

## A Dutiful Riddle

An oldie but a goody (IMO): ****************************** Five-walled open house Shut my door and make it four. I know exactly who you are, Where you sleep, friends you keep. A loyal soldier out on tour I take my leaves overseas. So pin the gold upon my breast, Give me orders crossing borders.
19. 1 point

MAFIA
20. 1 point

## Re-ROLLO

Ooh. It's been a while. ROLLO - Logic: At this point, I don't need logic.
21. 1 point

## 3D Connect the Dots

just guesing without doing calculation.
22. 1 point

23. 1 point

Coins
24. 1 point

## Alphabetize my Dvd's

Pickett (or anyone), Try this sequence: AGDICFEBKJH
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26. 1 point

For part I.
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29. 1 point

## Painting Blocks

Form a “triangle” with 10 blocks in its top row, 9 blocks in the next row, etc., until the bottom row has one block. Each row is centered below the row above it. Color the blocks in the top row red, white and blue in any way. Use these two rules to color the remaining rows of the triangle: • If two consecutive blocks in a row have the same color, the block between them in the row below has the same color. • If two consecutive blocks in a row have different colors,the block between them in the row below has the third color. Tell how you can always predict the color of the bottom block after seeing only the top row (and not constructing the intermediate rows).
30. 1 point

Great job.
31. 1 point

## The Price of Wine

Much more satisfying, as well! Good one.
32. 1 point

## Polygons make a line

@Perhaps check it again I thought of that distinction as well, and it led me back to the OP, where I found that the word "interior" is not mentioned. It has been agreed that a line cannot always pass through the interior of polygons so described. It has been clarified that BMAD asks something different. Not all Denizens share English as their primary language, so discussions like this one are generally helpful if taken in that regard.
33. 1 point

34. 1 point

## Stand and topple

Why do I say that?
35. 1 point

## optimal game strat

Here's a concrete example. I tried modifying the code so it generates a matrix of steps to get from each starting point to each goal, just like the matrix I posted earlier, and runs from 1 to 30 so I could directly compare the matrices they produce. They differ at some spots, one of which is the path going from 11 to 3. For some reason it took four steps and went 11/11=1, 11+11=22, 22/11=2, 2+1=3. Obviously a shorter path would be 11/11=1, 1+1=2, 1+2=3. Apparently there are two equally short paths from 11 to 2: {11/11=1, 1+1=2} and {11+11=22, 22/11=2}, and the algorithm ended up storing the second path as the most efficient path to get to 2. However, since it didn't store the path to 2 that creates 1 as an intermediate rather than 22, it wasn't able to discover that you could reach 3 from a path going to 2 through 1 that had a useful intermediate already generated.
36. 1 point

## optimal game strat

I've been trying to figure out what makes your code run so much faster, and I think I can more or less follow its logic but I'm not sure about one point. If you wanted to get from a starting point of 1 to an ending point of 7, you could do that with 1+1=2 2*2=4 2+1=3 4+3=7 With the algorithm, after you get one path with 1, 2, 4 and another path with 1, 2, 3 it looks like the first of those sets wouldn't allow you to add 4 in the next round because there is already a different path to reach 4, and the second of those sets wouldn't allow you to add 3 in the next round because there is already a different path to reach 3. (This is from the next if (exists(\$m->{\$result})); line.) I'm wondering if it would have a way of discovering that path to 7? For the most part our algorithms seem to agree, but when I set the max size for both algorithms to 30, mine said you can go from 25 to 13 in 4 steps (from the matrix in my earlier post) while yours said that 25 to 13 took 6 steps (when I commented out the if (\$start{\$s}{\$STEPS} == \$start{\$start_best}{\$STEPS}) {and subsequent close bracket surrounding the print statement). A path with four steps is:25/25 = 1 25+1 = 26 1+1 = 2 26/2 = 13
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38. 1 point

## Bake it

This is a variation on the problem of 2 people trying to split something. [where A cuts and B chooses which half]. One solution that solves this problem, but can be used for any practical value of N people
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43. 1 point

## i am thinking of a number...

44. 1 point

this is like my other post
45. 1 point

## Three Nuns

Not for kids or catholics, that's for sure. I would prefer cleaner ones. That's just me I guess.
46. 1 point

## One Up Me

Getting my sister in trouble for trolling me in college; it was totally worth it!!!
47. 1 point

## One Up Me

Use caution when travelling the rural areas of China, because in China, all cows know kung-fu and can tell when you're thinking about steak!
48. 1 point

## Sheikh's Heritage

Would the father know which camel was which, otherwise what would be the point to switching. Seems to me that the two brothers should have set up an agreement and split the inheritance.
49. 1 point

## Crocodile Sophism

Perhaps I'm not understanding the question here. However, it would seem to me the obvious issue and advice here would be to say: "You'll eat the child Mister Crocodile." Remember: this is an ancient beast more known for clamping down and rolling around in muddy pools of water than for it's scholarly dissertations on high energy physics. In the confusion where it doesn't know if it should consume the kid and thus have to return him, unharmed, or fail to and thus be compelled to do so - grab the child and run away. If you are very kind you might leave behind an aluminium crocodile hat/heatsink as the poor guy tries to figure out what just went wrong.
50. 1 point

## Sheikh's Heritage

of course the truely harmonious answer would be tfor the brothers to decide that no amount of wealth and fortune should be allowed to come between them and then for them to walk harmoniously into town at the exact same time making the father decide another way how to divide the moeny
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