# 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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Amb
Amb the Hitched.

 Posted: Tue Mar 12, 2013 10:43 pm    Post subject: 1
Amb
Amb the Hitched.

 Posted: Sun Mar 17, 2013 10:11 pm    Post subject: 2 Well I have been trying and trying and got nowhere.
esme
Daedalian Member

Posted: Sun Mar 17, 2013 11:24 pm    Post subject: 3

 Amb wrote: Well I have been trying and trying and got nowhere.
Have you tried making a correct figure? Also, this is a classic, I did not realize that you do not know the answer. Do you want a hint?
_________________
Mundus vult decipi, ergo decipiatur.
Quailman
His Postmajesty

 Posted: Mon Mar 18, 2013 1:53 am    Post subject: 4 I found a website with a solution here.
Amb
Amb the Hitched.

 Posted: Mon Mar 18, 2013 3:04 am    Post subject: 5 To be honest, I didnt know this was a classic. I thought it was fairly knew. I saw one solution in passing, but didnt remotely understand the first few sentences. I might keep trying a bit longer before giving in and reading the link.
novice
No harm. Pun intended!

 Posted: Mon Mar 18, 2013 9:43 pm    Post subject: 6 I haven't read the link, but I would guess the key is to Construct point F on line BD so that the length ED = EF. Then observe that triangles AEF and BED are congruent, and somehow prove that the lines CD and EF intersect at right angles, yielding x=30.
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