BrainDen.com - Brain Teasers

wolfgang

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1. Two people cross a river

Is it possible to use a.....
2. Hard riddle

(BR / BL +UR) UL Thus... (8/4 +2) 3= 12 (2/1 + 6) 4= 32 (9/3 +4) 2= 14 and for the last one.. (6/2 +3) 5 = 30
3. My brand new( Closed room )theory

The Big Bang theory is the prevailing cosmological model for the universe from the erliest known periods through its subsequent large-scale evolution.The model accounts for the fact that the universe expanded from a very high density and high temperature state Some estimates place this moment at approximately 13.8 billion years ago, which is thus considered the (age of the universe) After the initial expansion, the universe cooled sufficiently to allow the formation of subatomic particles, and later simple atoms. Giant clouds of these primordial elements later coalesced through gravity to form stars and galaxies. My question was so: what if the whole universe was inside a colsed room? and the galaxies were just like dust particles hanging there , if these paricles are subjected to a continuous diverging gravity ,so they will expand. That means , that there was NO start point and NO Big bang theory ! What do you think?
4. Counterfeit coin

We should devide the 12 coins into three groups, 5,5,and 2 1- for the first five, we weigh 2 against 2, leaving one coin aside. a- if they are blanced,we put them aside. b.- if they areĀ“nt balanced. we should weigh the heavier two with any other two coins :- now... if they balanced so the counterfeit coin is one of the two light coins,which will be easy to be find with the third weigh.....and if they are heavier,then we should weigh them one against one,,,and they heavier is the counterfeit coin. 2- for the 2nd five .we will do the same 2 against 2,leaving one coin aside:- a- if they are balanced, so one of the two coins left aside is the counterfeit coin, which will be easy to find with the 3rd weigh. b- if they are not balanced....see above.
5. Find the right sequence

abcdef bc abged abgcd fgbc .........? afedcg abc
6. Find the right sequence

Amasing!!! you did find all the sequences from 0 to 7 ...but 5 is wrong..
7. Find the right sequence

No..sorry...try again Note that: abcdef= 0 Note that: abcdef= 0
8. Find the right sequence

It seems to be hard....so let me give you a hint....which is: 5
9. Serial numbers...but!

Hello,,,who can give me the next three numbers : 74 , 34 , 14 , 73 ,13 , 92 , 32 , (?) , (?) , (?)

Great!
11. Serial numbers...but!

still not the right numbers
12. 7 brothers

Tomaca Pipsuka
13. Serial numbers...but!

Hint....( think of....primary numbers)
14. Serial numbers...but!

no...they are wrong

16. numbers by the book

There are alot of possible solutions , one of these is:- Andy........125 Bob.........213 Tim..........342 Fred........432 greg........513
17. numbers by the book

Sorry...may I ask a question?. Is it true for the digits in the middle ot at the end of the choosen number to be unique also?

22. Find The Apples

can I ask a silly question? Do we get the same answer, if we change the three rooms and apples with three positive numbers written on three papers?

24. Hands up!

Three persons( A,B,and C) are not allowed to speak,but to raise a hand refering to ( Yes or No ), you don`t know which hand means Yes,and which means No. How can you know the persons which is which by asking only three( yes or no) questions. You may ask one ,two or all of them...as you like. any question should be asked to a single person.
25. Easy magical Triangle

Hi dear friends... 1- Draw an equilateral triangle ABC. 2- Make two points on each side to get (ABC+6point= 9 points), with 4 points on each side. 3- Give the numbers( 1 to 9 ) to these points, so that the sum of 4 numbers on each side is the same. i.e. A+point1+point2+B= B+point3+point4+C= C+point5+point6+A have fun
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