BrainDen.com - Brain Teasers

Moderator

72

6954

Members

67

1525

Members

63

2198

Members

47

3394

## Popular Content

Showing content with the highest reputation since 09/27/12 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. 1 point

## Nameless Riddle

Well THAT fell fast!
4. 1 point

## Smallest Grid to Fit 1 2 3 4 5 6 7 8 9 0

so far just 2
5. 1 point

## Burning Riddle

But off Course! : )
6. 1 point

## Burning Riddle

Though seldom seen, I'm world renowned Ever in flight above the ground. Teeth chewing, gnashing in time gnawing on knots, shunning the find. My hands at the ready, arms at the stay Heart like the sun, burning away. Ears like a rabbit's, pinned to the side-- Listening close, far and wide.
7. 1 point

## Burning Riddle

Are you a .....
8. 1 point

## Mouse & Cheese Cube

The answer should be 25. My "proof" is a brute force programming solution. I have a psuedocode c++ bruteforce solution. I can give the full version if requested. It takes a few seconds to brute force all possible paths. This might count as a proof, depending on if you trust the computer to be reliable. Basically what it does is it generates all possible paths, and then prunes as it goes along so the program dosen't take basically forever, or 6^27 moves. Now a proof will involve some theorems in graph theory, which I don't yet know all that well. Assume the XYZ plane void recursive_dumb_solution( A 3D cube,Position of X, Y, and Z of current spot,direction it went twice ago, direction it went to get here){ if traveled along a direction twice in a row, return to the above function. else if( x<0 || x > 2 || y < 0 || y > 2 || z < 0 || z > 2) AKA if it exited the cube, return. else if(cube[x][y][z] == 1) AKA if visited spot already visited, then return. else{ //mark the current position of the cube as visited. cube[x][y][z] = 1; /////Moves in every direction possible. recursive_dumb_solution(cube, x+1, y, z, length+1,'x',prev_dir); recursive_dumb_solution(cube, x-1, y, z, length+1,'x',prev_dir); recursive_dumb_solution(cube, x, y+1, z, length+1,'y',prev_dir); recursive_dumb_solution(cube, x, y-1, z, length+1,'y',prev_dir); recursive_dumb_solution(cube, x, y, z+1, length+1,'z',prev_dir); recursive_dumb_solution(cube, x, y, z-1, length+1,'z',prev_dir); cube[x][y][z] = 0; return; } }
9. 1 point

10. 1 point

## I'm Back

Greetings, my name is Cody and I am new here in this forum. Nice meeting you all. Although I have never heard of it, I am actually quite curious about what it is!
11. 1 point

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

. What is the value of x If 1/2, 2/3, 3/4, 4/5, 5/6, 6/7, 7/8, 8/9, 9/10 then x/1000? x = 500,000 2. If 4 and 2= 26, 8 and 1 = 79 and 6 and 5 = 111. Then, what is 7and3?...410 3. What 3 positive numbers give the same result when multiplied and added together? 2 4. What number do you get when you multiply all of the numbers on a telephone's number pad? zero 5. Here is a light switch. Note the order of the positions. If the light is now at medium and it is switched 3922 times what will be the position of the switch? medium 6. Can you arrange four nines to make it equal to 100. 99 9/9 8. If 1/2 of 5 is 3, then what is 1/3 of 10? 3.67 9. 100 students entered college. 55 of them chose music. 44 of them chose sports. 20 of them chose both. How many of them chose neither music nor sports? 21 10. Four friends are going to a concert. When they arrive, there are only five seats together left in the theater. The manager will let all four friends in for free if one of them can tell her how many different seating arrangements are possible for four people with five empty seats. 240 All four are let in free. Could you have given the correct answer? 240 12. At six o’clock the wall clock struck 6 times. Checking with my watch, I noticed that the time between the first and last strokes was 30 seconds. How long will the clock take to strike 12 at midnight? 5 hrs 59 1/2 minutes 13. There are several books on a bookshelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf? 9 14. John has been hired to paint the numbers 1 through 100 on 100 apartments. 11 How many times he has to paint 8? 11 15. You have two books. One of them is upside-down and the other is rotated so the top of the book is facing you. What is the sum of the first page in each book? 1 +1 16. There is a certain club which is for men only. There are 600 men who belong to this club and 5% of these men wear one earring. Of the other 95% membership, half wear two earrings and the other half wear none. How many earrings are being worn in this club? 600 17. Does a pound of gold or a pound of feathers weight more? feathers 18. There is a chain nailed to the wall. The chain is 10 feet long and the center of the chain dips down 5 feet from where each side of the chain is nailed to the wall. How far are the 2 ends of chain from each other? on the same nail 19.Little Johnny is walking home. He has \$300 he has to bring home to his mom. While he is walking a man stops him and gives him a chance to double his money. The man says "I'll give you \$600 if you can roll 1 die and get a 4 or above, you can roll 2 dice and get a 5 or 6 on at least one of them, or you can roll 3 dice and get a 6 on at least on die. If you don't I get your \$300." What does Johnny do to have the best chance of getting home with the money? keep on walking 20. If you have 6 women and 2 friends, how many women do each of your friends get if the friends are two of the 6 women;i.e. women themselves , then each is entitled to herself, or one each/ If the two friends are male then no women.
12. 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!
13. 1 point

14. 1 point

15. 1 point

## Comparing a rectangle to a circle

It certainly should. It clearly fails a units check. Good catch.
16. 1 point

17. 1 point

## Chess Board Puzzle

Use the twelve pieces on the left to create a chess board, The pieces may be flipped!
18. 1 point

## Video Game Logic

Perhaps your question may hinge on the source of variability. Pistol has 5-7. In any skirmish, is the choice between 5, 6, 7 made by the program randomly? Or does it depend upon distance to target? Or visibility ( like heavy, light or no fog)? And, as Pickett points out, damage radius is a key parameter of the Dupuy lethality index.
19. 1 point

## Video Game Logic

Another factor to possibly consider...
20. 1 point

21. 1 point

## Westworld Mafia

Does the Indy trap appear even if it doesn't save anyone from actual death? Can they act on themselves? Do the goodie save and the Indy trap appear identically in the night post?
22. 1 point

## Probability of selecting two blue discs back to back

If a box contains twenty-one coloured discs, composed of fifteen blue discs and six red discs, and two discs were taken at random, it can be seen that the probability of taking two blue discs, P(BB) = (15/21)×(14/20) = 1/2. The next such arrangement, for which there is exactly 50% chance of taking two blue discs at random, is a box containing eighty-five blue discs and thirty-five red discs. By finding the first arrangement to contain over 1012 = 1,000,000,000,000 discs in total, determine the number of blue discs that the box would contain.
23. 1 point

24. 1 point

## I'm not a Trump supporter

We're being intruded by migrants secluded Who stowaway past our frontier They're costing us green and will linger unseen Unless I should get into gear Their nature I'll dredge as I perch on a ledge And twisting the truth's my endeavor Exposed to the nation, and next: deportation They thought they'd endure thus forever? I promise the answer has nothing to do with politics
25. 1 point

## Forgotten District II Mafia

Can I be the one to own you Molly? Or be owned by you? Please
26. 1 point

Player A has one more coin than player B. Both players throw all of their coins simultaneously and observe the number that come up heads. Assuming all the coins are fair, what is the probability that A obtains more heads than B?
27. 1 point

## Signups for Forgotten District II Mafia

On my phone, I see a link on each post that says "quote". I can sort of copy and paste the roster on phone but as I found out last game, the cursor had an unfortunate habit of moving... Spoilers and colors on phone have to be done with the [ ] codes. Spoiler: {spoiler}your text here{/spoiler} with [ ] instead of { }. No spoiler titles. Colors: {color=red/orange/whatever}text here{/color} also with [ ] instead of { }.
28. 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.
29. 1 point

@SakuraChan
30. 1 point

## Signups for Forgotten District II Mafia

Roster: 1. maurice 2. Flamebirde 3. Molly Mae 4. 5. 6. Hirkala 7. bonanova 8. 9. 10. Roster: 1. maurice 2. Flamebirde 3. Molly Mae 4. 5. 6. Hirkala 7. bonanova 8. 9. 10. Mafia!!! Been too long! I don't know if I was supposed to leave it doubled, but I did. Hi, everyone!
31. 1 point

32. 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.
33. 1 point

## UN Mafia III

@Thalia, good points. I've played only a few Mafia games. I wish I had accepted Unreality's invite to play, back in the day, and learned it better. Coupled with a hope for a few more games to follow this one. My comfort zone is math and logic, where all the needed info is provided, just needing insight and clear thought. This is more fun, actually, and with experience I might get better. Or, I'm a very slippery guy and everything I just said is garbage. . When does the night end?
34. 1 point

## UN Mafia III

Taps watch. Oops. RIP MikeD. Would love to hear from maurice.
35. 1 point

36. 1 point

## 1000 people in a circle

Assuming N people, the last standing (S) is given by: S=2*(N-2^m)+1, where m=floor[ln(N)].
37. 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
38. 1 point

## The Donny Hall puzzle

I think phaze is right about the most practical answer. If that fails, I tend to agree with bonanova.
39. 1 point

## A paradox? of two chests

You enter a room with two chests. You know that one chest has a lot of money (but you are unsure as to which). You know the other chest has half as much. Being the greedy person you are you want the most money but the chest are indistinguishable from each other outside of opening and counting the contents. You picked the first chest. Just before you open it, the owner of the chests offers you an opportunity to switch. Should you?
40. 1 point

## Balderdash - a game of deceit

Anyone here ever play the board game Balderdash? I was thinking this would make for a fun forum game and there are some similarities to Mafia, methinks. For those who have not played the gist is this. Player A selects a card. That card has an obscure word and the definition. Player A reads aloud the word and then proceeds to write down the definition while all other players write down their own definition. Usually they do not know the definition. This is fine as that is not the goal. Player A shuffles all of the definitions and reads them aloud. Points are scored for guessing the correct definition, other players guessing your definition, actually writing the correct definition, and Player A scores if nobody guesses correctly. The version I have also has Names, Dates, Acronyms and Movie Titles. The subject is chosen by the roll of a die. So here's my thought. We get 6-10 players to sign up, I will serve as a perpetual "Player A" I will roll a die and select a card. Then I will post the "word" and subject matter. Players have 24 hours to pm me their "definitions". After those 24 hours, I will post the "definitions" and players vote on them roster style a la Mafia. You do not score points for voting for your own "definition". Chatter is encouraged. After 24 hours I will announce the correct "definition" and post scores. This will go on until somebody scores 20 points, I'm thinking 2-3 weeks. Scoring is as follows: - Players submitting the correct definition are immediately awarded 3 points - Players are awarded 2 points if they guess the correct definition. - Players are awarded 1 point for each other player who incorrectly chooses the fake definition they submitted. - The Host is awarded three points if no one guesses the correct definition. If there is interest, I would like to start Sunday. I'm thinking I may try to create a game board, but don't hold me to that. I would like players to select a color, however. If you'd like to play place your name next to a color. The rules we will play by are in the spoiler below. Isolating to make signups easier Host - maurice Red - Blue - Green - Purple - Orange - LimeGreen - Turqoise - Brown - HotPink - Gray -
41. 1 point

42. 1 point

MYTHS MAGIC
43. 1 point

PHASE
44. 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
45. 1 point

## Re-ROLLO

I think a word a little less thick with correct letters could score you more points.
46. 1 point

47. 1 point

## Re-ROLLO

MAFIA Cuz, yeah
48. 1 point

## Re-ROLLO

Ooh. It's been a while. ROLLO - Logic: At this point, I don't need logic.
49. 1 point

## Light Bugs

There are multiple solutions:
50. 1 point

## Cutting yet another cake

×

• #### Activity

• Riddles
×
• Create New...