# The Grey Labyrinth is a collection of puzzles, riddles, mind games, paradoxes and other intellectually challenging diversions. Related topics: puzzle games, logic puzzles, lateral thinking puzzles, philosophy, mind benders, brain teasers, word problems, conundrums, 3d puzzles, spatial reasoning, intelligence tests, mathematical diversions, paradoxes, physics problems, reasoning, math, science.

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Lepton
1:41+ Arse Scratcher

 Posted: Fri Mar 11, 2011 9:41 am    Post subject: 1 On Monday, I'm going to host a Puzzlevanian party for all my GL friends. Since you're all hungry, I've made a huge dish of a certain food (it's flat, and has a surface area of 4 square meters). Now, the first guest to the part comes in a takes a slice that is 1/3 of the dish, but then realizes he isn't very hungry, so he puts back 1/5 of the dish -- eating just two fifteenths of the dish. The next guest takes 1/7 of the dish, but then puts back 1/9 of it. The third guest takes an eleventh, but then puts back a thirteenth. This continues for quite a while. Two questions: (a) What is the area of the dish that remains after the party is finished? (b) What is the food we were eating? Happy Monday, everyone! Deliberately not posted in VSP... not really a puzzle.
Pablo
Never Draws a Blank

 Posted: Fri Mar 11, 2011 2:09 pm    Post subject: 2 The area of the dish is still 4 square meters. The food is some kind of pi._________________All religions are the same - Guilt....just with different holidays.
Jack_Ian
Big Endian

 Posted: Fri Mar 11, 2011 3:09 pm    Post subject: 3 Well amount of meal left is SUM(-2/((4n)^2 - 1)) - 1 for n=0 to NumberOfGuests. But I don't recognise it and I can't see any pi. Perhaps the meal is Tart?
wordcross

 Posted: Fri Mar 11, 2011 3:31 pm    Post subject: 4 I assure you, it's pi._________________Has anyone really been far even as decided to use even go want to do look more like?
Jack_Ian
Big Endian

 Posted: Fri Mar 11, 2011 3:56 pm    Post subject: 5 In that case there's 3m 2 left and Gregory got half.
Zag
Unintentionally offensive old coot

 Posted: Fri Mar 11, 2011 4:08 pm    Post subject: 6 Why wasn't this in VSP? Nice puzzle, by the way.
groza528
No Place Like Home

 Posted: Fri Mar 11, 2011 4:50 pm    Post subject: 7 Sorry mec, I can't make it
Lepton*
Guest

 Posted: Sun Mar 13, 2011 6:21 am    Post subject: 8 I was aiming to represent the series 4*(1 - 1/3 + 1/5 - 1/7 + ...). Not a great puzzle, I guess. And it's not in VSP because the point was to say happy Pi day in a very GL fashion.
Dragon Phoenix
Judge Doom

 Posted: Sun Mar 13, 2011 8:23 am    Post subject: 9 What Pi sounds like...._________________My photography: http://www.flickr.com/photos/artrock2006/
Pablo
Never Draws a Blank

Posted: Sun Mar 13, 2011 12:40 pm    Post subject: 10

 Lepton* wrote: I was aiming to represent the series 4*(1 - 1/3 + 1/5 - 1/7 + ...). Not a great puzzle, I guess. And it's not in VSP because the point was to say happy Pi day in a very GL fashion.

You did exactly that. It was obvious to me that the solution was in that series, but I didn't know how to find the sum of it, so I opted out on a technicality. The dish, as you asked, was still 4 square meters, even with less pi on it.
_________________
All religions are the same - Guilt....just with different holidays.
Pablo
Never Draws a Blank

 Posted: Mon Mar 14, 2011 4:09 pm    Post subject: 11 Happy Pi Day!_________________All religions are the same - Guilt....just with different holidays.
Death Mage
Raving Lunatic

 Posted: Mon Mar 14, 2011 4:32 pm    Post subject: 12 Nah dude, we still got 4 more years before a real pi day._________________* These senseless ramblings brought to you by Insanity™. If you just can't figure the dang thing out, it must be Insanity™. [YOUR AD HERE!]
+1

 Posted: Mon Mar 14, 2011 4:39 pm    Post subject: 13 I've been telling all my UK friends 'NO PI FOR YOU"_________________And he lived happily ever after. Except for the dieing at the end and the heartbreak in between.
Sentran
Ray of Sucking Funshine

 Posted: Mon Mar 14, 2011 5:22 pm    Post subject: 14 3.14% of all sailors are pi-rates._________________Sentran "Speaking of double negatives, I haven't read greylab yet today." - Lifeinmomland
+1

 Posted: Mon Mar 14, 2011 11:23 pm    Post subject: 15 PI is a lie_________________And he lived happily ever after. Except for the dieing at the end and the heartbreak in between.
wordcross

 Posted: Tue Mar 15, 2011 12:40 am    Post subject: 16 I stole that for facebook (gave you credit, though)_________________Has anyone really been far even as decided to use even go want to do look more like?
Beartalon
'Party line' kind of guy

Posted: Tue Mar 22, 2011 11:43 pm    Post subject: 17

 Samadhi wrote: PI is a lie

Heh - Tau day would be my birthday.
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