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 --
Offline Last Active Feb 22 2015 02:57 PM

#340565 Precast

Posted by wolfgang on 12 October 2014 - 09:14 AM

Spoiler for I think.. he should

  • 1

#338925 Amount of air in a glass

Posted by wolfgang on 06 July 2014 - 01:32 PM

If we have an emty cylindrical  glass  on a flat table with a dice inside it , naturally, it will contain an amount of air inside it.

Now , if we invert this glass upside down on the table, leaving the dice still inside it but landing on the table , will the amount of air inside the glass changes?

If yes, would it be more or less, and why?

If no...why?


  • -1

#331974 Weighing problem again...

Posted by wolfgang on 11 May 2013 - 04:30 PM

You have 8 coins that all look  exactly the same, two of them are fake,one of these two fake coins is 0.1gm more than a normal coin, whereas the second coin is 0.1 gm less than a normal coin.

 With howmany weighings can you find them out  using a balance scale?

  • -1

#329747 Knight Checker

Posted by wolfgang on 16 March 2013 - 07:53 PM

Spoiler for Lets try this..

  • 1

#326895 The Good , The Wise & The Lucky

Posted by wolfgang on 01 January 2013 - 05:19 PM

Spoiler for I think

  • 1

#326888 Find the missing combination

Posted by wolfgang on 30 December 2012 - 10:38 PM

Spoiler for My answer

Yes...thats right....it is the magic sguare

  • 0

#323306 Nice puzzle !

Posted by wolfgang on 27 July 2012 - 09:20 PM

Hi my friends...I`ve prepared a nice puzzle to you..
Here we go:-
Cut 9 pieces of paper,write a number on each one of them,from 1 to 9,put them in a pot,put the pot on a table.
Your aim is to arrenge these numbers on the table in this order: 123456789
according to the following rules:
1- you can choose any number to be the first number, and put it on the table.( for example I choose number 4).
2-take a second number and compare it with the number on the table, if.. 2nd>1st....put it to the left.
if 2nd<1st...put it to the right.( in my example, if I choose 7...I`ll get 74.....but if I choose 3.....will be 43).
3-now whenever you have an even amount of numbers on the table( two numbers,4,6,or 8), you should insert any number you want
between them,just in the middle.(in my example, if I want to choose 5,so I should put it in the middle to get 754,,,or 453).
4- you are allowed to take any number from the table and put it back in your pot. but to put any number again on the table,you should follow the rules.
5-to put the 4th number, you should compare it with the middle number( in my example...with number 5), if the choosen number>than
the middle number....put it to the left, if the choosen number < than the middle number...put it to the right.(in my example, if I choose
number 9,,so 9>5...I`ll get 9754,,,or 9453).
6-as in step 3.
7-whenever you have an odd amount of numbers on the table(one number,3,5,7,or 9),you should compare your choosen number with
the middle number, if your choosen number>the middle number....put it to the left.
if your choosen number<than the middle number.....put it to the right.

Have a nice time :)
  • 1

#321590 Good reason

Posted by wolfgang on 08 July 2012 - 06:20 PM

The teacher asking a student:
Which is the farthest , the moon or Australia?
The student(after a short time): Australia
Teacher(surprised) : why.. !?
Student: because we can see the moon, but we can not see Australia.
  • 4

#319028 we need a small paint program

Posted by wolfgang on 18 June 2012 - 07:14 PM

I think it is very useful to add a small (paint) program ,either to edit new puzzles or to answer others.
  • 1

#318855 Evidence of God's Design

Posted by wolfgang on 17 June 2012 - 11:37 AM

Hello...God bless you all
I believe in God for a very simple,uncomplicated reason,
If anyone asks me a very easy mathmatical question, e.g.(If the sum of 2 numbers is 17 ,and the difference between them is 1...what are the numbers?)
My brain will assume the first number to be (X) , simply, because I don`t know the answer, now....Is (X) a real number?....YES it is.
Does it exsist?...YES....and so on.
Old people saw all around,human,creatures,earth,stars.....without knowing where did they come from....so they assume that there is someone who creates all these things, they gave him the name(GOD) insted of (X)...So he is real and exsists.
  • 1