Unanswered Questions
388 questions with no upvoted or accepted answers
9
votes
0
answers
357
views
A Glutton and a Split Check
N, T, A, B are arbitrary constants in this problem. I have only definitively solved the N=1 subproblem, so, if the general problem cannot be solved, I will be satisfied to mark as accepted a solution ...
- 2,389
9
votes
0
answers
288
views
Rolling dice in a box
A box containing identical dice that were arranged to have same orientation has a missing die at the center (see figure). The dice moves to the free space for they can change orientation and ...
- 6,656
9
votes
0
answers
688
views
Signatures of serial killer Edward Wayne Edwards?
This is from a real-life murder-mystery. In 2009 Edward Wayne Edwards was arrested and convicted of five murders, following a tip-off from his daughter April. Former detective John A. Cameron ...
- 1
9
votes
0
answers
474
views
The highest poem
I am three, often a person, always a digit, and also witout.
George POUST was his name.
Manufactured by Ford between 1972 and 1976.
YMCA was not my first team in my coaching career.
Theory of ...
- 10.3k
9
votes
0
answers
289
views
Zed's Order: Breakfast at Elon's
My friend Elon and I constantly irritate each other. He recently built himself a rather respectable restaurant – a sort of bed-&-breakfast, minus the beds. Last week, he asked if I could ...
- 793
9
votes
0
answers
488
views
What causes these signs to follow this relation?
Can you find why does the below relation hold true?
Hint 1
Hint 2
- 3,943
9
votes
0
answers
367
views
My drunken formula?
I know that today is an important day, but I can't remember why... All I have in my possession is this formula I wrote last night in my drunken stupor:
You go here:
$$B = 25 + \biggl(\frac{O}{...
- 10.6k
9
votes
1
answer
2k
views
Is there another name for this puzzle? (Kyudoku, Nine Find)
Is there another name for this type of puzzle? I can only find two examples of it online:
https://www.brainzilla.com/logic/kyudoku/
http://ninefind.com/
In the game you start with a 6x6 grid filled ...
CommunityBot
- 1
8
votes
0
answers
450
views
Cookie Unionization
My Christmas cookies are gone! When I came into the kitchen this morning, the box was empty. All that remained were a few crumbs and this note:
We absconded.
You never saw that coming, did you? Well, ...
- 400
8
votes
0
answers
277
views
Doubling the cube with rational Meccano strips
In three monographs published in 2006, 2008 and 2014 Gerard 't Hooft considered "Meccano mathematics": how to construct specified distances and regular polygons by a rigid system of ideal ...
- 7,820
8
votes
0
answers
620
views
Connect The Wall-Words:
We have a group of 16 words here:
ACIDITY
TIME
MICROSCOPE
MARKS
LIGHT
SCALE
CHEMISTRY
CLAW
REAL
LEAD
INTEREST
BIOLOGY
DUCK
RADICAL
ACADEMY
LEAF
Goal: Group these $16$ words into $4$ groups, each ...
- 53
8
votes
0
answers
423
views
An Evil Cartesian Psycho
I came up with this puzzle when I was in high school.
There is an island owned by an evil man who keeps some tourists who were visiting the island a few years ago captive.
The authorities demanded ...
- 2,272
8
votes
0
answers
227
views
There are 49 cards here. Figure out what the seven facedown cards are and what position they're in
So here's the problem
"There are 49 cards here. Can you figure out what the seven facedown cards are and what position they're in?"
I have tried about everything in my math tool belt to try ...
- 10.4k
8
votes
0
answers
556
views
Ode to a Nightingale: a puzzling study in literary criticism
The field of literary criticism is an interesting and fruitful one, in which puzzlers might carve out a niche. This was recently brought home by a conversation I had with a sagacious old gentleman in ...
- 5,430
8
votes
0
answers
529
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Impossible Cipher v1.0
When I create riddles, ciphers etc.. they seem to get solved within only a couple of days of writing. Well no more! This cipher may not be impossible but is extremely difficult. If left unsolved for ...
- 2,630