Who is behind QuickerMaths?
I am Vineet Patawari - PGDM (IIM Indore), ACA, B.Com(H). My passion for Mathematics, specially Vedic Maths encouraged me to start QuickerMaths
I believe that if trained properly using powerful tools like Vedic Maths, the immense intellect of human mind can be ignited instantly - find out more
Get Maths Tricks by Email
Recent Comments
A, B and C can do a piece of work in 40, 60 and 120... – 07Feb12
as a night watchman he is not supposed to sleep during the night . as... – 06Feb12
ramlal is a night watchman and he is sleep on duty therefor boss fire him,... – 06Feb12
Dear, It is good..... But I was already given this question on 06-12-2011 at 11.08... – 05Feb12
he rewarded the watchman because watchman saved his life by warning him that the plane... – 05Feb12
Most Popular
- 100% Finding Cube Root – Vedic Maths Way
- 67% Shortcut to Find Square of a Number
- 57% Shortcut Method for Multiplication
- 56% Shortcut to find the Cube of a number
- 53% Squaring any 2-digit number
- 49% Divisibility Rule of 7, 13, 17, 19, 23, 29, 31, 37, 41, 43 and 47
- 45% Division in Vedic Mathematics
- 45% Herons Method of Finding Roots
- 43% You can make a difference
- 41% Quicker Maths by M Tyra
- 40% Quick calculations for extremely large numbers
- 39% Divisibility Rules for 7 , 11 and 13
- 37% How to convert from decimal to other number systems
- 36% Quick Multiplication up to 20 x 20
- 35% Logical Reasoning Books
May 22nd, 2011 - 19:29
suhaaaaan dont you study maths
May 22nd, 2011 - 19:26
i know the thing may be A must have peeped his eyes through the blind folding cloth
March 26th, 2011 - 13:39
There are only 2 black hats. If both A and B were wearing black hats, then C would know for sure that he was wearing white.
But since C could not guess the colour, it means that not both of A and B are wearing black.
This means,
Either, one among A and B is wearing black and the other is wearing white
Or, both A and B are wearing white.
Now, if A was wearing black, B would know for sure that he was wearing white (as both A and B can’t be wearing black).
But since, B did not have an answer, it means A was not wearing black.
Therefore, A was wearing white hat, which he correctly answered.
March 10th, 2011 - 13:30
A IS HOLDING BLACK
POSIBLITIES
A IS HOLDING WHITE BCOZ
A- B C
W W ======IN THIS C CAN PREDICT SO NOT POSIBLE
W B IN THIS C CANT PREDICT BUT B CAN AS C IS SILENT AND A IS HAVING WHITE
SO B OR C CAN PREDICT ONLY WHEN A IS HAVING WHITE SINCE THEY DID NOT RESPOND HENCE A WILL COME TO KNOW THAT HE IS WEARING WHITE
March 19th, 2011 - 13:53
brilliant!!!!!!!!!!!!!!!!
March 8th, 2011 - 13:24
Since “C” can see the users “A” & “B”, if the hat of ‘A’ & ‘B’ is white, he can say that the hat which he wears is Black as there is only two white hat and the rest three is black. When “C” confirms that he is wearing black, “A” & B can be sure that they are wearing White hat. As stated, all three are intelligent.
February 17th, 2011 - 18:10
Though A cannot see but can very well ask B about the colour of his hat as there is not such condition in the question that they cannot ask each other. B’s replies is white. Hence A is wearing white. Answer is WHITE.
January 24th, 2011 - 13:58
A is wearing white hat
as B and C cant predict becouse
C sees A AND B wearing white and dont know about his colour
B sees only A wearing white cant predict his colour’
so A can predict that he wear a white hat
January 22nd, 2011 - 20:49
Very Simple!!
A will see B’s hat.
B will see C’s hat
C will see A’s hat
January 23rd, 2011 - 11:56
kya baat kar diye cherry bhai……..!!!!
January 20th, 2011 - 13:17
As informed in the puzzle “all are intelligent” the possibilities are as follows:
A B C
Black Black White C would have declared that he is wearing White
Black White ?(B/W) If C remains silent B can say he is wearing white
White White ?(B/W) C & B are silent hence A says he is wearing white
White Black ?(B/W)
Hence A is wearing white hat.
January 19th, 2011 - 21:10
A is wearing white hat…..this is because if C didnt commented dat means the other two were weraing white hats which confused him…..
Also if A was wearing black hat B could have easily deduced dat he is wearing a white hat based on C’s answer but he himself was confused…….
Due to these reasons A waited till 59 seconds so he could make sure if anybody can comment and answered dat he is wearing a white hat.
June 16th, 2010 - 19:16
If it is BB for A&B then C’s hat must be White. C didn’t speak coz A&B have either WW or WB or BW. Now A & B are left with below choices.
A B
W W
W B
B W
IF A is holding Black hat then B’s hat must be White. B Didn’t speak coz A is holding White hat and B may have either White or block.
Now the choice left is A having White hat.
May 22nd, 2010 - 03:35
Shalin.. there are no red hats in the question.
May 20th, 2010 - 23:06
C won’t know his hat if he sees A & B either wearing both white or one white one black
now B khows C didn.t answer so he is sure that the colour of his hat & A’s is both white or 1 blck 1 white
now B won’t b able to answer if he sees the colour of a’s hat to b white
this A khows
so he answers the ques
April 23rd, 2010 - 19:09
C dint say nythng ths means A n B hav hat combinations as WW or WB or BW
now B dint say nythng ths means A is nt wearng black…….cz A==Black means his hat has to b White.This shows A wearng White
Thus A’s hat==White:)
April 21st, 2010 - 15:12
Shalin.. there are no red hats in the question.
April 20th, 2010 - 19:06
HES WEARING RED HAT.
IF C SEES A & B WEARING BLACK HATS , HE COULD SAY HE IS WEARING RED HAT. HE DOESNOT SAY. SO A & B BOTH ARE WEARING RED HATS OR ONE OF THEM HAS A BLACK HAT.
IF B SEES A WEARING A BLACK HAT , HE CAN SAY THAT HE HAS A RED HAT. BUT EVEN HE IS NOT ABLE TO DECIDE.
SO A MUST BE WEARING A RED HAT.
February 24th, 2011 - 20:42
buddy bhai, where r u bringing this red hat from???
May 22nd, 2011 - 19:28
what an idea sirji