Jump to content

Welcome to BrainDen.com - Brain Teasers Forum

Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.

Of course, you can also enjoy our collection of amazing optical illusions and cool math games.

If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top.
If you have a website, we would appreciate a little link to BrainDen.

Thanks and enjoy the Den :-)
Guest Message by DevFuse

- - - - -

  • Please log in to reply
2 replies to this topic

#1 puzzled


    Junior Member

  • Members
  • PipPip
  • 65 posts

Posted 11 February 2008 - 10:53 AM

Your grandfather is staying at your house. One day he gets sick and tells you "I need an egg, newly cooked for exactly 15 minutes in 15 minutes or I will faint". A problem you encounter is that the only timing devices you have are a 7 minute hourglass and an 11 minute hourglass. How will you do it?
  • 0

#2 bonanova



  • Moderator
  • PipPipPipPip
  • 5634 posts
  • Gender:Male
  • Location:New York

Posted 11 February 2008 - 11:13 AM

Spoiler for This should work

  • 0
The greatest challenge to any thinker is stating the problem in a way that will allow a solution.
- Bertrand Russell

#3 rookie1ja


    Senior Member

  • Site Admin
  • PipPipPipPip
  • 1337 posts
  • Gender:Male
  • Location:Slovakia

Posted 11 February 2008 - 11:28 AM

good one, however, it's already posted - check Sand-glass II.

there is more of this type in the section called Water and Weighing Puzzles

looking forward to new puzzles ... this thread is locked
  • 0

rookie1ja (site admin)
Optical Illusions
Support BrainDen

"To start: Press any key... Where's the 'any' key?" - Homer Simpson

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users