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


Member Since 08 Oct 2012
Offline Last Active Oct 22 2013 04:27 PM

Posts I've Made

In Topic: Nested Figures in a Pentagon

20 October 2013 - 01:18 PM

no clue about this one. seems to me the lowest prime number the outside could be is 11, with the blue diamond being 7 and the black pentagon being 3.

but how to prove that is beyond me.

When you said the blue diamond, did you mean the blue star?  If so, it would have a larger perimeter than the red pentagon.  But that is all I can determine.

In Topic: Turn off the light

18 October 2013 - 06:13 PM

Spoiler for I think the answer is.


(Although the scale of the problem makes my head hurt)

In Topic: Hairy Inhabitants

10 October 2013 - 10:40 PM

Spoiler for I'm thinking the answer is....

In Topic: Slicing up n-d shapes.

20 September 2013 - 01:59 PM

Spoiler for my answer

In Topic: Colorful Elephants

16 September 2013 - 10:34 PM

The remaining 2/3 can be evenly split into 400 blue and 400 pink and green, but it is also possible that there are 23 blue elephants and 777 pink and green. There is no "definite" here.

your 'observation' is only valid if those were the only colors allowed.  For all we know, there is one blue, one pink and green and 798 grey elephants.