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PostPosted: Thu Jan 10, 2008 5:59 pm 
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Another sneaky one: Two brothers Bob and Bill. Bob claims to have twice as many girl friends as Bill. Bill says that they have the same number of girl friends. Could they both be right? [Answer on next posting.]

They don't have any girlfriends at all.


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PostPosted: Thu Jan 10, 2008 6:03 pm 
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Adam wrote:
They don't have any girlfriends at all.

Good thinking :D
The correct solution is usually the simplest one.

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PostPosted: Thu Jan 10, 2008 7:04 pm 
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No, that doesn't work. There is a much more straightfotward solution! It dorsn't have to be girl friends. Look, it could just as well be the following: Bob claims to have twice as much money as Bill, and Bill says that they both have the same amount of money, yet both of them are right. How can that be?

Raymond


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PostPosted: Thu Jan 10, 2008 7:48 pm 
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*wiping drool off chin* My brain hurts. :roll:

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PostPosted: Thu Jan 10, 2008 7:50 pm 
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rsmullyan wrote:
No, that doesn't work. There is a much more straightfotward solution! It dorsn't have to be girl friends. Look, it could just as well be the following: Bob claims to have twice as much money as Bill, and Bill says that they both have the same amount of money, yet both of them are right. How can that be?

Raymond

Bob has Euros and Bill has dollars ? :wink:

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PostPosted: Thu Jan 10, 2008 7:57 pm 
techneut wrote:
rsmullyan wrote:
No, that doesn't work. There is a much more straightfotward solution! It dorsn't have to be girl friends. Look, it could just as well be the following: Bob claims to have twice as much money as Bill, and Bill says that they both have the same amount of money, yet both of them are right. How can that be?

Raymond

Bob has Euros and Bill has dollars ? :wink:


:lol:


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PostPosted: Thu Jan 10, 2008 8:11 pm 
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I'll give you a hint: From the information given about the girl friends, one can deducr exactly how many girl frieds each one has, and in the variant I gave involving money instead of girl friends, one can deduce exactly how much money each one has!
Raymond


Last edited by rsmullyan on Thu Jan 10, 2008 8:56 pm, edited 1 time in total.

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PostPosted: Thu Jan 10, 2008 8:13 pm 
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Location: Obamanation, unfortunately...
Each have four girlfriends, but one folds his girlfriends in half, thus doubling the amount :(

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PostPosted: Thu Jan 10, 2008 8:37 pm 
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Ah cute. Bob has two (twice as many as Bill which counts for one here). Bill has none, and together they have two. That is sneaky indeed, the keyword we tend to overlook is "they".

I liked Adam's answer better as that is mathematic and does not depend on word semantics. And mine, because it is kinda funny (at least I thought that when posting :lol: )

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PostPosted: Thu Jan 10, 2008 9:05 pm 
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Joufa, there is no reason why in your solution, the number 4 should work better than any other number-- it could just as well be that each brother has ten, and one of the brothers folds five of them in half! I told you that from the information I gave, it is deducible exactly haw many each has, and there is only ONE possible solution!
Raymond


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PostPosted: Thu Jan 10, 2008 10:07 pm 
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Location: Obamanation, unfortunately...
Hmmm...this is a good question. Then, with my last gasp, I would like to ask: do imaginary girlfriends count?

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PostPosted: Fri Jan 11, 2008 12:05 am 
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Juufa, No; imaginary girl friends do NOT count!Now really; can't you think of a number such that twice the number is the same as the number itself?
Raymond


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PostPosted: Fri Jan 11, 2008 12:41 am 
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1? 1 x 1 = 1...

That seems to work...

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PostPosted: Fri Jan 11, 2008 3:05 am 
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Juufa, No, the number 1 doesn't work. Twice 1 is not the sam as 1X1. Twice 1 is i+i, which is 2. In general, for any number n, twice n is not nXn , but n+n. For example, twice 5 is certainly not 5X5 (which is 25), but 5+5, which is 10.
Raymond


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PostPosted: Fri Jan 11, 2008 4:27 am 
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whoops... read the question wrong... :oops:

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"This is death! This is death as this emanation of the female which leads to unification ... death and love ... this is the abyss." This is not music", said [Sabaneev] to him, "this is something else..." - "This is the Mysterium," he said softly.


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PostPosted: Fri Jan 11, 2008 5:46 am 
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rsmullyan wrote:
Juufa, No; imaginary girl friends do NOT count!Now really; can't you think of a number such that twice the number is the same as the number itself?
Raymond

Did you not read Adam's response then ?

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techneut wrote:
Did you not read Adam's response then ?

Exactly what I was thinking. He said that doesn't work, for some reason, but as far as I know, 2x0=0. :D Perhaps there's a more clever answer that he's looking for? But I can't get past the 0, because I don't see why it doesn't work. :cry:

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PostPosted: Fri Jan 11, 2008 9:11 am 
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Terez wrote:
techneut wrote:
Did you not read Adam's response then ?

Exactly what I was thinking. He said that doesn't work, for some reason, but as far as I know, 2x0=0. :D Perhaps there's a more clever answer that he's looking for? But I can't get past the 0, because I don't see why it doesn't work. :cry:

Yup, last time I checked, 2x0 was still zero. But you never know with today's crazy pace of science and technology... Maybe at absolute zero temperatures, things start working differently. :lol:

Raymond may have been referring to my first, contrived, 'solution'. IMO there is no more straightforward solution than the zero, but the latest hint seems to point in another direction (which I think I guessed after the hint).

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techneut wrote:
the latest hint seems to point in another direction (which I think I guessed after the hint).

wellllll....aren't you going to tell us? :roll: :lol:

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Terez wrote:
techneut wrote:
the latest hint seems to point in another direction (which I think I guessed after the hint).

wellllll....aren't you going to tell us? :roll: :lol:

I already did, yesterday ! But is't probably wrong - this is an elusice one it seems...

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PostPosted: Fri Jan 11, 2008 10:24 am 
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They had no girl friends. Twice zero is the same as zero.


Now for a riddle: Which musical instrument is particularly intelligent?[[Answer next time.]

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PostPosted: Fri Jan 11, 2008 11:36 am 
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pianolady wrote:
They had no girl friends. Twice zero is the same as zero.

Dangit, Ray! All that brain-bleeding for nothing! :lol:

Quote:
Now for a riddle: Which musical instrument is particularly intelligent?[[Answer next time.]

The clarinet? As in, like....clairvoyant? That's the best I can come up with at the moment. :D

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pianolady wrote:
They had no girl friends. Twice zero is the same as zero.

This had already been guessed, then dismissed as not correct :roll:

pianolady wrote:
Now for a riddle: Which musical instrument is particularly intelligent?[[Answer next time.]

The theremin. It plays without even being touched.

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PostPosted: Fri Jan 11, 2008 12:38 pm 
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I seem to have completely missed this thread!

I'll attach something that might keep you away from the piano for a while ;). Yes, you can "brute force" your way through it but it is more fun if one think first. Download and run (you need Powerpoint installed).

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PostPosted: Sat Jan 12, 2008 4:26 am 
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has anyone else tried this river quiz? It's impossible! :evil: I think I've tried everything.
Robert - can it be solved?

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pianolady wrote:
has anyone else tried this river quiz? It's impossible! :evil: I think I've tried everything.
Robert - can it be solved?

Hehe! Of course it can. I would never put up something impossible. Quiet a family they are :)!

The rules are:
- Dad can't be left with any of the daughters. If so, he beats them.
- Mum can't be left with any of the sons. If so, she beats them.
- The thief can't be left alone without the police, if so, the thief beats anyone in the family.
- Only the policeman, mum or dad can operate the raft.
- Only two persons on the raft at the same time.
- Everyone should be moved over to the other side of the river.
- The raft cannot go anywhere without mum, dad or the policeman.

Hints that are not that revealing:
- Of course, mum, dad or the policeman can go on the raft by themselves.
- You must go back and forward more times than you first believe. I counted and it takes 17 rides before you are done.

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PostPosted: Sun Jan 13, 2008 12:05 pm 
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Which musical instrument is intelligent? --The clever-chord.


(I still can't get the family across the river :x :))

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PostPosted: Sun Jan 13, 2008 6:17 pm 
I think I know the solution to the River IQ-test… :D

Here is my solution:
1 Policeman and Thief across the river, Policeman back.
2 Policeman and Daughter I across the river, Policeman and Thief back.
3 Mother and Daughter II across the river, Mother back.
4 Father and Mother across the river, Father back.
5 Policeman and Thief across the river, Mother back.
6 Father and Mother across the river, Father back.
7 Father and Son I across the river, Policeman and Thief back.
8 Policeman and Son II across the river, Policeman back.
9 Policeman and Thief across the river… done…

Or of course (Mother = Father and Daughter = Son):
1 Policeman and Thief across the river, Policeman back.
2 Policeman and Son I across the river, Policeman and Thief back.
3 Father and Son II across the river, Father back.
4 Father and Mother across the river, Mother back.
5 Policeman and Thief across the river, Father back.
6 Father and Mother across the river, Mother back.
7 Mother and Daughter I across the river, Policeman and Thief back.
8 Policeman and Daughter II across the river, Policeman back.
9 Policeman and Thief across the river… done…


Admin edit to small font in case people wants to try on their own.


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PostPosted: Sun Jan 13, 2008 6:29 pm 
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abimopectore wrote:
I think I know the solution to the River IQ-test… :D

And you are 100% correct :D. I edited your post a bit to make sure people who wants to solve it on their own do not get the answer thrown in their face.

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PostPosted: Sun Jan 13, 2008 8:04 pm 
OK :wink:


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The physicist Dirac once gave a lecture at the end of which, he said : " Are there any questions?" One student raised his hand and said: " Professor Dirac, I didn't understand your proof of Theorem 3." Professor Dirac replied : " That's not a question! "

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PostPosted: Mon Jan 14, 2008 3:45 pm 
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Location: Obamanation, unfortunately...
I might not understand the pun on math or logic; but I do understand the grammatical punchline of the statement. :roll:

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So far, our lovely pianolady has been kind enough to post my jokes and puzzles for me, because I was not quite sure how to do it, but now I think I do, hence from now on, I will post them myself. My deepest thanks to Monica!

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PostPosted: Tue Jan 15, 2008 4:00 am 
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pianolady wrote:
So far, our lovely pianolady has been kind enough to post my jokes and puzzles for me, because I was not quite sure how to do it, but now I think I do, hence from now on, I will post them myself. My deepest thanks to Monica!


Oh my god!! She's gone schizo!! :lol:

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No Nathan; I wrote that, not the pianolady! I don't know how the mistaken attribution came about! Probably something I did wrong, as usual!

Raymond


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rsmullyan wrote:
No Nathan; I wrote that, not the pianolady! I don't know how the mistaken attribution came about! Probably something I did wrong, as usual!

Raymond

:!: :?:

What! Did your previous post take the handle of Monica. That was really weird. I have never seen it happen before.

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OK, now I will start posting my stuff myself.

A 2-volume set of books is sitting on a shelf. Volume 1 has 256 pages and Volume 2 has 257 pages. A bookworm starts from the first page of Volume 1 and bores its wat to the last page of Volume 2. The thickness of the pages of each volme is two inches, and each cover is one quarter of an inch thick.How far did the worm fravel?

NOTE: Whenever I end with a question, the answer will be given next time.


Last edited by rsmullyan on Tue Jan 15, 2008 4:47 pm, edited 1 time in total.

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:lol: :lol:

Raymond - I think you just made a kind of paradox/riddle right here. "How can one member post a message but it shows up as being from another member?"

FYI you other guys - I was doing the posting for Raymond, including the last one, which is why it's from pianolady and not Raymond.

my guess - the worm traveled 4 1/2 inches?

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4 :?:

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My english is probably not good enough for the details. If the complete cover of a single book is 1/4 inch, then the front side or back side of the cover is each 1/8 inch, provided the thickness is equally distributed.

Then the worm goes through 2*2 inches (paper way) and 2*1/8 cover ways, that means 4 1/4 inches all together?
But maybe Raymond will have it more precisely. The first book has 256 pages, and the second book has 257 pages. I assume the worm starts inclusively the first page of the first book, and reaches the last page of the second book (but eats not through the last page, very, very important!).

So more precisely I would say, the way is 2 inches + 1/4 inch + 2*256/257inches, what means alltogether NEARLY 4.242217899 inches :lol:

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rsmullyan wrote:
OK, now I will start posting my stuff myself.

A 2-volume set of books is sitting on a shelf. Volume 1 has 256 pages and Volume 2 has 257 pages. A bookworm starts from the first page of Volume 1 and bores its way to the last page of Volume 2. The thickness of the pages of each volume is two inches, and each cover is one quarter of an inch thick.How far did the worm travel?

NOTE: Whenever I end with a question, the answer will be given next time.

Assuming that Volume 1 is on the left and Volume 2 is on the right and that the books are arranged in a traditional bookshelf manner, it would be .5 inches. If Volume 1 is on the right and Volume 2 is on the left and the books are arranged in a traditional bookshelf manner, then it would be 4.5 inches. I'm not sure why you included the number of pages, though. :lol: Unless it was in an attempt to make the trick of the riddle as plain as possible without giving it away...

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Good for you. Terez!


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Oh yeah [hitting myself on the head]. Good one!
Should have known it would have been trickier than what I first thought. :oops:

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pianolady wrote:
Oh yeah [hitting myself on the head]. Good one!
Should have known it would have been trickier than what I first thought. :oops:

Yes, riddles are never that simple, though this one was pretty simple as far as riddles go. :D Though I think Ray should have worded it a bit better. 8)

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PostPosted: Wed Jan 16, 2008 1:42 am 
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Quote:
though this one was pretty simple as far as riddles go.

Great :x :lol:

Ok, Terez gets a point. But Olaf should get something for his answer - like a handshake, or .0001 point because although incorrect, it sounded good. :lol:

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PostPosted: Wed Jan 16, 2008 3:10 am 
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Especially for a non-native English speaker! He should receive .0002 points!


Here is something to ponder:


Do nihilists accept absolute zero?

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pianolady wrote:
Ok, Terez gets a point.

Yay!
Quote:
But Olaf should get something for his answer - like a handshake, or .0001 point because although incorrect, it sounded good. :lol:

It wasn't incorrect, really, any more than your answer was. Because if Volume 1 were on the right, you would be correct, and Olaf would also be correct if at the same time a bit nitpicky. :lol:

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For the bookworm problem, I am assuming that the books are in the normal position, in which Volume 1 is to the left of Volume 2, in which case the 1st page of Volume 1 is separated from the last page of Volume 2 only by two book covers! And so the answer is one- half an inch (as some of you have already realized), not 4.5 inches, which is the usual answer. But as Terez correctly pointed out , if Vol. 1 were to the right of Vol. 2, then the answer would be 4.5 inches. Terez was also right in that in the statement of the problem, I should have said that the two volumes were in the normal position in that Vol.1 was to the left of Vol.2.

Here is another one, perhaps too simple: A certain draw contains 24 blue socks and 24 red socks .Someone goes into the room where the draw is, but the room is dark. What is the minimum number of socks she must take out of the draw to be sure that she has two socks of the same color? [Answer given next time.]


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PostPosted: Wed Jan 16, 2008 4:35 am 
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rsmullyan wrote:
For the bookworm problem, I am assuming that the books are in the normal position, in which Volume 1 is to the left of Volume 2, in which case the 1st page of Volume 1 is separated from the last page of Volume 2 only by two book covers! And so the answer is one- half an inch (as some of you have already realized), not 4.5 inches, which is the usual answer. But as Terez correctly pointed out , if Vol. 1 were to the right of Vol. 2, then the answer would be 4.5 inches. Terez was also right in that in the statement of the problem, I should have said that the two volumes were in the normal position in that Vol.1 was to the left of Vol.2.

Here is another one, perhaps too simple: A certain draw contains 24 blue socks and 24 red socks .Someone goes into the room where the draw is, but the room is dark. What is the minimum number of socks she must take out of the draw to be sure that she has two socks of the same color? [Answer given next time.]


:shock: uhhh... would the answer be 3 socks? Because if you draw the first, it's either red or blue... then the second could be the same as the first, or different. Then the 3rd would automatically match one of the two picked originally.

:idea: Oh... and Nihilists don't believe in absolute zero, because they believe the universe has no absolute constants!

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"This is death! This is death as this emanation of the female which leads to unification ... death and love ... this is the abyss." This is not music", said [Sabaneev] to him, "this is something else..." - "This is the Mysterium," he said softly.


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PostPosted: Wed Jan 16, 2008 7:59 am 
Instinctively i'll say 25 - the chances of the first 24 being all of the same colour are extremely remote, but to be certain.......


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