Brain Teasers and Maths Puzzles

Here you can talk about anything (that isn't related to the other forums).

Moderator: Crew

User avatar
eMTe
Cyberflaneur
Posts: 6941
Joined: Wed Mar 08, 2006 23:08
Location: Cracow

Re: Brain Teasers and Maths Puzzles

Post by eMTe » Wed Dec 12, 2012 22:25

Certainly he does being blind and subjected to devious schemes of omnipotent mathematician. But he has no choice.
"As you have noticed over the years, we are not angry people." (itebygur)

User avatar
eMTe
Cyberflaneur
Posts: 6941
Joined: Wed Mar 08, 2006 23:08
Location: Cracow

Re: Brain Teasers and Maths Puzzles

Post by eMTe » Mon Dec 17, 2012 23:54

I still wait for Tormuse, who always participated actively in this topic. Because, much to my regret, nobody seems to know the answer. Or at least nobody tried to find it. :D

Hint: puzzle is not lateral.
"As you have noticed over the years, we are not angry people." (itebygur)

User avatar
Pater Alf
The Steel Spine of GameHunters
Posts: 7648
Joined: Thu Apr 13, 2006 23:09

Re: Brain Teasers and Maths Puzzles

Post by Pater Alf » Tue Dec 18, 2012 0:32

Is the man allowed to ask questions? And does he need to use all cards?
[quote="eMTe"]I dont think trying to pass the screen in computer game once per 500 tries makes you a geek. Rather a dangerous psychopath.[/quote]

User avatar
eMTe
Cyberflaneur
Posts: 6941
Joined: Wed Mar 08, 2006 23:08
Location: Cracow

Re: Brain Teasers and Maths Puzzles

Post by eMTe » Tue Dec 18, 2012 1:02

Pater Alf wrote:Is the man allowed to ask questions?
No, he is not allowed. He's a slave. If his answer is wrong he is forced to have a reverse gangbang intercourse with forty Japanese teenagers, so he desperately tries to answer correctly.
Pater Alf wrote:And does he need to use all cards?
Sure he does, otherwise he would end up with more than TWO piles.
"As you have noticed over the years, we are not angry people." (itebygur)

User avatar
Zyx
Pretender to the throne
Posts: 1863
Joined: Wed Mar 29, 2006 20:48
Location: Helsinki
Contact:

Re: Brain Teasers and Maths Puzzles

Post by Zyx » Tue Dec 18, 2012 10:53

eMTe wrote:
Pater Alf wrote:Is the man allowed to ask questions?
No, he is not allowed. He's a slave. If his answer is wrong he is forced to have a reverse gangbang intercourse with forty Japanese teenagers, so he desperately tries to answer correctly.
Female or male teenagers? :?
Do you has what it takes to join the Homestarmy? The guts? The determination? The five bucks? Join today!

User avatar
eMTe
Cyberflaneur
Posts: 6941
Joined: Wed Mar 08, 2006 23:08
Location: Cracow

Re: Brain Teasers and Maths Puzzles

Post by eMTe » Tue Dec 18, 2012 23:25

It wasn't disclosed in original puzzle, so I believe this information is not crucial for the solution.
"As you have noticed over the years, we are not angry people." (itebygur)

User avatar
Pater Alf
The Steel Spine of GameHunters
Posts: 7648
Joined: Thu Apr 13, 2006 23:09

Re: Brain Teasers and Maths Puzzles

Post by Pater Alf » Wed Dec 19, 2012 0:55

Even if I have no idea how this should lead to a solution: Is he allowed to turn cards around?
[quote="eMTe"]I dont think trying to pass the screen in computer game once per 500 tries makes you a geek. Rather a dangerous psychopath.[/quote]

User avatar
eMTe
Cyberflaneur
Posts: 6941
Joined: Wed Mar 08, 2006 23:08
Location: Cracow

Re: Brain Teasers and Maths Puzzles

Post by eMTe » Wed Dec 19, 2012 9:52

Whatever. Why not? 8)
"As you have noticed over the years, we are not angry people." (itebygur)

Drasir-Vel
[insert custom title here]
Posts: 1483
Joined: Sun Jan 18, 2009 15:28
Location: Denmark

Re: Brain Teasers and Maths Puzzles

Post by Drasir-Vel » Wed Dec 19, 2012 14:10

eMTe wrote:Blind man is given a standard pack of cards (52). Ten of these cards are with faces up.

Now his task is to make two piles (they can contain different number of cards), but each pile must contain the same number of cards with faces up.

What does he do?

Hint: the man is blind, but the cruel puzzle creator didn't allow him to use cards with braille
He asks someone else to do it for him?

User avatar
eMTe
Cyberflaneur
Posts: 6941
Joined: Wed Mar 08, 2006 23:08
Location: Cracow

Re: Brain Teasers and Maths Puzzles

Post by eMTe » Wed Dec 19, 2012 23:04

That would mean the puzzle is lateral, but it isn't. It is logical and mathematical.
"As you have noticed over the years, we are not angry people." (itebygur)

User avatar
Pater Alf
The Steel Spine of GameHunters
Posts: 7648
Joined: Thu Apr 13, 2006 23:09

Re: Brain Teasers and Maths Puzzles

Post by Pater Alf » Wed Dec 19, 2012 23:26

I even picked up a deck of cards and tried some things. But I still have no idea how it can be done.
[quote="eMTe"]I dont think trying to pass the screen in computer game once per 500 tries makes you a geek. Rather a dangerous psychopath.[/quote]

User avatar
eMTe
Cyberflaneur
Posts: 6941
Joined: Wed Mar 08, 2006 23:08
Location: Cracow

Re: Brain Teasers and Maths Puzzles

Post by eMTe » Thu Dec 20, 2012 0:32

Since I know the solution I know it can be done. I tried to prove that there's a hole, but there isn't.
"As you have noticed over the years, we are not angry people." (itebygur)

User avatar
Tormuse
Warhero
Posts: 326
Joined: Sat Jun 17, 2006 21:30
Location: Toronto, Canada

Re: Brain Teasers and Maths Puzzles

Post by Tormuse » Thu Dec 27, 2012 6:45

eMTe wrote:I still wait for Tormuse, who always participated actively in this topic. Because, much to my regret, nobody seems to know the answer. Or at least nobody tried to find it. :D
Aww, I didn't realize you were waiting for me! :D
Zyx wrote:
eMTe wrote:
Pater Alf wrote:Is the man allowed to ask questions?
No, he is not allowed. He's a slave. If his answer is wrong he is forced to have a reverse gangbang intercourse with forty Japanese teenagers, so he desperately tries to answer correctly.
Female or male teenagers? :?
Female... but he's gay, so he doesn't like it. :P
Pater Alf wrote:Even if I have no idea how this should lead to a solution: Is he allowed to turn cards around?
I have a feeling this is part of the solution, but the trouble is that if he can't tell which way the cards are to start, he could just as easily turn the face-up cards down as turn the face-down cards up, and any card he separates from the deck could go either way without his knowing which way it is. I'll have to give this some thought, but I don't see how to do this right away unless he has some extra source of information.

Just to clarify, there's no way for him to tell which way a card is turned using his other senses?
[size=84]"A Canadian is someone who knows how to make love in a canoe."
Pierre Burton[/size]

User avatar
eMTe
Cyberflaneur
Posts: 6941
Joined: Wed Mar 08, 2006 23:08
Location: Cracow

Re: Brain Teasers and Maths Puzzles

Post by eMTe » Thu Dec 27, 2012 13:26

I can clarify it once again - this puzzle is pure maths and logic, so no other senses are involved and no laterality at all.
"As you have noticed over the years, we are not angry people." (itebygur)

User avatar
Tormuse
Warhero
Posts: 326
Joined: Sat Jun 17, 2006 21:30
Location: Toronto, Canada

Re: Brain Teasers and Maths Puzzles

Post by Tormuse » Fri Dec 28, 2012 7:57

I've got it! All ten face-up cards leave the island on the tenth day after the Guru announces she sees a blue-eyed card!

(Just kidding) :P

I've been thinking about this puzzle a fair bit today, considering different ways of dividing the deck and flipping portions of it, and remixing them, but it all comes out the same... There's no way for the blind man to know which way any given card starts or finishes, or what proportion of any section of the deck has cards that are face-up at any given time. I'm sorry; I don't see how to solve this. I think I need a hint. :| (Just a hint!)
[size=84]"A Canadian is someone who knows how to make love in a canoe."
Pierre Burton[/size]

User avatar
Pater Alf
The Steel Spine of GameHunters
Posts: 7648
Joined: Thu Apr 13, 2006 23:09

Re: Brain Teasers and Maths Puzzles

Post by Pater Alf » Fri Dec 28, 2012 13:36

Same here. I tried a lot of things with a deck of cards to find a solution. But I can't see that there is a way to solve this puzzle. So a hint would be great.
[quote="eMTe"]I dont think trying to pass the screen in computer game once per 500 tries makes you a geek. Rather a dangerous psychopath.[/quote]

User avatar
eMTe
Cyberflaneur
Posts: 6941
Joined: Wed Mar 08, 2006 23:08
Location: Cracow

Re: Brain Teasers and Maths Puzzles

Post by eMTe » Fri Dec 28, 2012 17:15

Tormuse wrote:There's no way for the blind man to know (...) what proportion of any section of the deck has cards that are face-up at any given time.
And here you are wrong! :D
"As you have noticed over the years, we are not angry people." (itebygur)

User avatar
Tormuse
Warhero
Posts: 326
Joined: Sat Jun 17, 2006 21:30
Location: Toronto, Canada

Re: Brain Teasers and Maths Puzzles

Post by Tormuse » Fri Dec 28, 2012 18:01

Was that the clue? :?

Sorry, eMTe, I don't see it. At the start, there are 10 face-up cards and 42 face-down cards. You can flip the whole deck to have 10 face-down cards and 42 face-up cards, but it doesn't make any difference. If you flip any one card, you will either be turning a face-up card down, or a face-down card up without knowing which you are doing. If you divide the deck into sections, you won't know how many in each section are face-up or how many are face-down, so if you flip that section, you won't know how many of each you're reversing.

I'm sure there's a very interesting solution to this, but I think I need a bigger hint than simply being told that I'm wrong.
[size=84]"A Canadian is someone who knows how to make love in a canoe."
Pierre Burton[/size]

User avatar
eMTe
Cyberflaneur
Posts: 6941
Joined: Wed Mar 08, 2006 23:08
Location: Cracow

Re: Brain Teasers and Maths Puzzles

Post by eMTe » Fri Dec 28, 2012 18:49

What's funny is that you have discovered the solution, but you don't believe that this is the solution. So as a hint - please read your last post once again. :D
"As you have noticed over the years, we are not angry people." (itebygur)

User avatar
Pater Alf
The Steel Spine of GameHunters
Posts: 7648
Joined: Thu Apr 13, 2006 23:09

Re: Brain Teasers and Maths Puzzles

Post by Pater Alf » Sat Dec 29, 2012 14:21

The more I try and the more I think about it, the less I believe there really is a solution. You can flip around cards and devide the deck into sections as long as you want. If you don't know where the face-up cards in the beginning, it won't help you.
[quote="eMTe"]I dont think trying to pass the screen in computer game once per 500 tries makes you a geek. Rather a dangerous psychopath.[/quote]

Post Reply