New Year Riddle

New Year Riddle - 31 December

Why did Navjot Singh sidhu put the new January calendar in the freezer

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Hard Math Problems

Hard Math Problems 1 : Smart Math Problem
Difficulty ★★★★☆        Popularity ★★★☆☆

As they say, beggars can't be choosers, in fact begger take what they can get. A begger on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the begger finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

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     Answer & Explanation

Solution:
14
If the begger can make a whole cigarette from 6 butts then he can make 12 cigarettes from the 72 he found. Once he smokes those, he then will have another 12 butts, which gives him enough to make another 2 cigarettes. A total of 14.

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Hard Math Problems 2 : Maths Handshake Puzzle
Difficulty ★★★★☆        Popularity ★★★★☆

At a party, everyone shook hands with everybody else. There were 66 handshakes. How many people were at the party?

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     Answer & Explanation

Solution:
12

In general, with n+1 people, the number of handshakes is the sum of the first n consecutive numbers: 1+2+3+ ... + n.
Since this sum is n(n+1)/2, we need to solve the equation n(n+1)/2 = 66.
This is the quadratic equation n2+ n -132 = 0. Solving for n, we obtain 11 as the answer and deduce that there were 12 people at the party.

Since 66 is a relatively small number, you can also solve this problem with a hand calculator. Add 1 + 2 = + 3 = +... etc. until the total is 66. The last number that you entered (11) is n.

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Hard Math Problems 3 : Hardest Mathematical Columbus Puzzle
Difficulty ★★★★★        Popularity ★★☆☆☆

The Puzzle: Here is a famous prize problem that Sam Loyd issued in 1882, offering $1000 as a prize for the best answer showing how to arrange the seven figures and the eight 'dots' .4.5.6.7.8.9.0. which would add up to 82

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     Answer & Explanation

Solution:
The dot over a number signifies that it is a repeater which would go on for ever, as when we endeavor to describe 1/3 decimally as 0.33333 . . . . (etc) With a series of numbers we place the dot over the first and last, as with 0.97979797979 . . . (etc) The remarkable feature being that a proper fraction divided by 9s e.g. 46/99 is exactly equal to the numerator with the repeater sign followed by the decimal.

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Hard Math Problems 4 : Maths Equation Puzzle
Difficulty ★★★★☆        Popularity ★★★☆☆

I know a way by which i can make i can get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

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     Answer & Explanation

Solution:
(0!+0!+0!+0!+0!)!
=(1+1+1+1+1)!
=(4)!
=5! is 5*4*3*2*1=120

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Hard Math Problems 5 : Answer a Maths Riddle
Difficulty ★★★★☆        Popularity ★★★☆☆

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

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     Answer & Explanation

Solution:
3211000

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Hard Math Problems 6 : Brain Twister Puzzle
Difficulty ★★★★☆        Popularity ★★★★★

2+3=8,
3+7=27,
4+5=32,
5+8=60,
6+7=72,
7+8=??

Solve it?

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     Answer & Explanation

Solution:
98

2+3=2*[3+(2-1)]=8
3+7=3*[7+(3-1)]=27
4+5=4*[5+(4-1)]=32
5+8=5*[8+(5-1)]=60
6+7=6*[7+(6-1)]=72
therefore
7+8=7*[8+(7-1)]=98
x+y=x[y+(x-1)]=x^2+xy-x

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Hard Math Problems 7 : Tough Age Puzzle
Difficulty ★★★★☆        Popularity ★★★☆☆

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

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     Answer & Explanation

Solution:
I am 72 years old.

Let m be my age in years. If s is my son's age in years, then my son is 52s weeks old. If g is my grandson's age in years, then my grandson is 365g days old. Thus,
365g = 52s.
Since my grandson is 12g months old,
12g = m.
Since my grandson, my son and I together are 120 years,
g + s + m = 120.
The above system of 3 equations in 3 unknowns (g, s and m) can be solved as follows.
m / 12 + 365 m / (52 x 12) + m = 120 or
52 m + 365 m + 624 m = 624 x 120 or
m = 624 x 120 / 1041 = 72.
So, I am 72 years old.

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Hard Math Problems 8 : Tricky Equation Puzzle
Difficulty ★★★★☆        Popularity ★★★★☆

Can you arrange four 9's and use of atmost 2 math symbols , make the total be 100?

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     Answer & Explanation

Solution:
99 / .99

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Hard Math Problems 9 : Weighing Balance Puzzle
Difficulty ★★★★☆        Popularity ★★★★☆

You can place weights on both side of weighing balance and you need to measure all weights between 1 and 1000. For example if you have weights 1 and 3,now you can measure 1,3 and 4 like earlier case, and also you can measure 2,by placing 3 on one side and 1 on the side which contain the substance to be weighed. So question again is how many minimum weights and of what denominations you need to measure all weights from 1kg to 1000kg.

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     Answer & Explanation

Solution:
For this answer is 3^0, 3^1, 3^2... That is 1,3,9,27,81,243 and 729.

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Hard Math Problems 10 : February Maths Puzzle 
Difficulty ★★★★☆        Popularity ★★★★★

Using eight eights and addition only, can you make 1000?

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     Answer & Explanation

Solution:
888 + 88 + 8 + 8 + 8 = 1000

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Sherlock Holmes Riddle

Sherlock Holmes Riddle - 29 December

British Police inspects a room where there is no windows,no doors,no tables and is almost empty expect there is just a puddle of water. They found a dead women who obviously hung herself from the ceiling, but they are not able to figure out how this had happen.

Sherlock and John Watson entered the crime scene and easily able to solve the case.

How did the women die ?


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Maths Operator Riddle

Maths Operator Riddle - 28 December

Can you get a sum of 1000 using sixteen 4s and only an addition operator


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What Does This Text Means

What Does This Text Means - 27 December

What does this text means

R+R

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Alphabet Riddle

Alphabet Riddle - 26 December


Which alphabet is a tool ?


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Hourglass Time Puzzle

Hourglass Time Puzzle - 25 December

There are 2 sand hourglasses.
The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

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Christmas Beggar Maths Puzzle

Christmas Beggar Maths Puzzle - 24 December

On Christmas , A beggar earns 71 rupees in form of 20-paisa and 25-paisa.
He collects total of 324 coins.

Can you tell me how many number of 20-paisa and 25-paisa he got ?

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Alphabet Letter Riddle

Alphabet Letter Riddle - 23 December


Which alphabet letter is a question ?


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Logic Problem Puzzles

Logic Problems Puzzles 1 : Donkey Puzzle
Difficulty ★★★☆☆        Popularity ★★★★★

A donkey travels the exact same distance daily.
strangely 2 of his legs travels 40 kilometers and the remaining two travels 41 kilometers.
Obviously 2 donkey legs cannot be a 1km ahead of the other 2.

The donkey is perfectly normal. So how come this be true ?

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     Answer & Explanation

Solution:
The donkey is moving in circular path and hence outside legs travels more distance than inner legs

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Logic Problems Puzzles 2 : Classic Logical Interview Puzzle
Difficulty ★★★☆☆        Popularity ★★★★★

I have two rectangular wires.
Both of them have property that when i light the fire from one end , it will take 60 minutes to get completely burn.
However they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could i measure 45 minutes ?

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     Answer & Explanation

Solution:
Steps:
A) burn 1st wire from both end and 2nd wire from one end
B) After 30 minutes(when 1st wire gets completely burned out) , burn the second wire from 2nd end as well
C) when 2nd run completely gets burned , you know its 45 minutes.

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Logic Problems Puzzles 3 : Prison Break Riddle
Difficulty ★★★☆☆        Popularity ★★★★★

Two prisoners 'Lincoln Burrows' and 'Michael Scofield' are locked in a cell.
There is open window approx 30 feet above the ground of the cell.
They are never able to reach there.

Then they plan to escape by a tunnel and they start digging out.
After digging for more than 20 days, Scofield comes with the different plan and they escaped.

what was the plan ?

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     Answer & Explanation

Solution:
They use the dirt and bricks from the tunnel and stand on it then one on top of the other.

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Logic Problems Puzzles 4 : Monty Hall Problem Puzzle
Difficulty ★★★☆☆        Popularity ★★★★★

The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

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     Answer & Explanation

Solution:
You better switch!

Your first choice has a 1/3 chance of having the car, and that does not change.
The other two doors HAD a combined chance of 2/3, but now a Goat has ben revealed behind one, all the 2/3 chance is with the other door.

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Logic Problems Puzzles 5 : No Uninvited Guest Puzzle
Difficulty ★★★☆☆        Popularity ★★★★★

Queen Elizabeth organized a royal party.

To Avoid uninvited guest royal family set a password.
Wayne (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Wayne thought is enough and he walked to the entry point. The security person said 'eight' , Wayne replied smilingly 'four'.
He was immediately thrown out of the party.

why ?

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     Answer & Explanation

Solution:
'five'

password is not half , rather the sum of digit.

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Logic Problems Puzzles 6 : Popular Liar Truth Riddle
Difficulty ★★☆☆☆        Popularity ★★★★★

Suarez is a strange liar.

He lies on six days of the week, but on the seventh day he always tells the truth.

He made the following statements on three successive days:

Day 1: 'I lie on Monday and Tuesday.'
Day 2: 'Today, it's Thursday, Saturday, or Sunday.'
Day 3: 'I lie on Wednesday and Friday.'

On which day does Suarez tell the truth?

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     Answer & Explanation

Solution:
Tuesday

We know that Suarez tells the truth on only a single day of the week. If the statement on day 1 is untrue, this means that he tells the truth on Monday or Tuesday. If the statement on day 3 is untrue, this means that he tells the truth on Wednesday or Friday. Since Suarez tells the truth on only one day, these statements cannot both be untrue. So, exactly one of these statements must be true, and the statement on day 2 must be untrue.
Assume that the statement on day 1 is true. Then the statement on day 3 must be untrue, from which follows that Suarez tells the truth on Wednesday or Friday. So, day 1 is a Wednesday or a Friday. Therefore, day 2 is a Thursday or a Saturday. However, this would imply that the statement on day 2 is true, which is impossible. From this we can conclude that the statement on day 1 must be untrue.

This means that Suarez told the truth on day 3 and that this day is a Monday or a Tuesday. So day 2 is a Sunday or a Monday. Because the statement on day 2 must be untrue, we can conclude that day 2 is a Monday.

So day 3 is a Tuesday. Therefore, the day on which Suarez tells the truth is Tuesday.

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Logic Problems Puzzles 7 : Most Famous Maths Puzzle
Difficulty ★★★☆☆        Popularity ★★★★★

I can prove why 1 = 2

* Lets say y = x
* Multiply through by x xy = x2
* Subtract y2 from each side xy - y2 = x2 - y2
* Factor each side y(x-y) = (x+y)(x-y)
* Divide both sides by (x-y) y = x+y
* Divide both sides by y y/y = x/y + y/y
* And so... 1 = x/y + 1
* Since x=y, x/y = 1 1 = 1 + 1
* And so... 1 = 2

How is this possible ?

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     Answer & Explanation

Solution:
Step 5 is invalid, because we are dividing by (x-y), and since x=y, we are thus dividing by 0. This is an invalid mathematical operation (division by 0), and so by not following basic mathematical rules

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Logic Problems Puzzles 8 : Logic Thinking Puzzle
Difficulty ★★★☆☆        Popularity ★★★★★

At a restaurant downtown, Mr. Red, Mr. Blue, and Mr. White meet for lunch. Under their coats they are wearing either a red, blue, or white shirt.Mr. Blue says, 'Hey, did you notice we are all wearing different colored shirts from our names?' The man wearing the white shirt says, 'Wow, Mr. Blue, that's right!'
Can you tell who is wearing what color shirt?

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     Answer & Explanation

Solution:
Blue could only be wearing white or red and we know that there is already someone else wearing the white shirt so Mr. Blue could only be wearing the red shirt.

Mr. White could have only been wearing a blue or a red shirt, and red is already taken, so Mr. White is wearing a blue shirt.

Mr. Red now has to be wearing a white shirt.

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Logic Problems Puzzles 9 : Fun Math Puzzle
Difficulty ★★★☆☆        Popularity ★★★★★

Baseball bat and ball cost $50. If the bat cost $49 more than the ball, what is the cost of each

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     Answer & Explanation

Solution:
bat $49.50, ball $0.50

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Logic Problems Puzzles 10 : Logic Interview Question
Difficulty ★★★★☆        Popularity ★★★★★

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its color and put it back into the box, without seeing the color of the other ball.

How many such operations are necessary to correctly label the boxes?

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     Answer & Explanation

Solution:
Just One!

Because we know all labels are wrong.
So the BW box must be either BB or WW. Selecting one ball from BW will let you know which.
And the other two boxes can then be worked out logically.

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Tricky Problem

Tricky Problem - 21 December

Neha was born in 1855.She just had her 30th birth day today.

how did that happen ?

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Rebus Mind Riddle

Rebus Mind Riddle - 20 December

What does this rebus means ?

U R YY 4 me

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Maths Algebra Puzzle

Maths Algebra Puzzle - 19 December

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

   * *
   x *
=====
 * * *

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Logical Puzzle Asked In Interview

Logical Puzzle Asked In Interview - 18 December

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, its less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?

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Maths Aptitude Puzzle

Maths Aptitude Puzzle - 17 December

A octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings.

How many insects do we have of each kind ?

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Nice Riddle

Nice Riddle - 16 December

How is the moon similar to a dollar ?

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Broken Riddle

Broken Riddle - 15 December

Can you name something which is more useful when broken ?

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What Word Problem

What Word Problem - 14 December

There is a five letter word which has 3 consonants(all are same) and 2 different vowels.
Also something wrong associated with the word.

Can you name it ?

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River Crossing Problem

River Crossing Problem - 13 December

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls.

How do they do it?

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Rebus Picture Riddle

Rebus Picture Riddle - 12 December

What does does this rebus picture means ?

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Logic Math Problem

Logic Math Problem - 11 December

In Sahara desert , 3 men found a big 24L Jar is full of water. Since there is shortage of water so they decided to distribute the water among themselves such that they all have equal amounts of it. But they only have a 13L, a 5L and an 11 liter Jar.

How do they do it?

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Logic Problem

Logic Problem - 10 December

There is a bag which have 21 blue balls and 23 red balls. You also have 22 red balls outside the bag.

Randomly remove two balls from the bag.
* If they are of different colors, put the blue one back in the bag.
* If they are the same color, take them out and put a red marble back in the bag.

Repeat this until only one marble remains in the bag.


What is the color of the sole marble left in the bag ?

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Textual Rebus Puzzle

Textual Rebus Puzzle - 8 December

What Does this tex means

important=important

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Guess The Number Puzzle

Guess The Number Puzzle - 7 December

I know a 5 digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number ?


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Tricky Death Punishment Riddle

Tricky Death Punishment Riddle - 6 December

Bill McFarland world's most popular thief was caught stealing.Because of his popularity,The judge give him a strange punishment.He order him to sentenced to death but he can choose his own way to die.

What way of death Bill McFarland must choose ?

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What Is It Puzzle

What Is It Puzzle - 5 December

You Throw The Outside, Cook The Inside
Eat The Outside , Throw The Inside.

What Is It ?

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Rebus Problem Puzzle

Rebus Problem Puzzle - 4 December

MOUNT MOUNT MOUNT MOUNT MOUNT
MOUNT MOUNT MOUNT MOUNT MOUNT

What does this rebus means ?

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Logic Problem Puzzle

Logic Problem Puzzle - 3 December

A donkey travels the exact same distance daily.
strangely 2 of his legs travels 40 kilometers and the remaining two travels 41 kilometers.
Obviously 2 donkey legs cannot be a 1km ahead of the other 2.

The donkey is perfectly normal. So how come this be true ?

For Solution : Click Here