Who Will Shout First?

4 criminals are caught and are to be punished. The Judge allows them to be freed if they can solve a puzzle. If they do not, they will be hung. They agreed.
The 4 criminals are lined up on some steps (shown in picture). They are all facing in the same direction. A wall separates the fourth man from the other three.
So to summarize :-

Man 1 can see men 2 and 3.

Man 2 can see man 3.

Man 3 can see none of the others.

Man 4 can see none of the others.

The criminals are wearing hats. They are told that there are two white hats and two black hats. The men initially don't know what color hat they are wearing. They are told to shout out the color of the hat that they are wearing as soon as they know for certain what color it is.

They are not allowed to turn round or move.

They are not allowed to talk to each other.

They are not allowed to take their hats off.

Who is the first person to shout out and why?

Who will shout first?

Know that person here! 

Source 

Chance of Knowing Color of Hat

Here is the given situation! 

Well, there are 2 possibilities of answer depending on what combination of hats Man 2 & Man 3 are wearing. One thing is sure Man 4 has least chance for getting what he is wearing. His crime must be the most serious one!

Case 1 : If Man 2 & Man 3 wearing same color of hat.

In this case, Man 1 would immediately come to know that he is wearing opposite color of hat & would shout out. In simple words, if Man 2 & Man 3 wearing WHITE (or BLACK) hats, then Man 1 & Man 4 must be wearing BLACK (or WHITE) hats. Since there is no chance for Man 4 to see Man 2 & Man 3 but Man 1 could see Man 2 & Man 3, he must be first to know color of hat he is wearing.


Case 2 : If Man 2 & Man 3 wearing hats of different color.

Now here Man 2 has to be very intelligent (like the reader as he has chosen to read this further). In this case, there is no way for Man 1 to come at any conclusion as there might be WHITE or BLACK hat on his head. After waiting for a while Man 2 has to apply some logic & should think this in his mind.

'Since Man 1 is not shouting he must be unsure with color of his hat. He would be sure only in case if I & Man 3 wearing same color of hats. Since he is unsure; the color of my hat must be opposite of Man 3's hat.' 

Now the judge if he is honest would put criminal with least serious crime at number 1 (or  & 2) same color (or different) hats on Man 2 & Man 3.  

 

A Most Unusual Paragraph

This is an unusual paragraph. I’m curious as to just how quickly you can find 
out what is so unusual about it. It looks so ordinary and plain that you would think nothing was wrong with it. In fact, nothing is wrong with it! It is highly unusual though. Study it and think about it, but you still may not find anything odd. But if you work at it a bit, you might find out. Try to do so without any coaching.

This is certainly unusual! 

Source 

This is The Unusual Thing!

What was the unusual? 

Well, you will not find anything wrong grammatically there neither you won't find any spelling mistake in entire paragraph. The letter 'e' is one of the most common letter used in English language. If you carefully observe the letter 'e' never appears in the paragraph.

The Ages of Three Daughters

I was visiting a friend one evening and remembered that he had three daughters. I asked him how old they were. “The product of their ages is 72,” he answered. Quizzically, I asked, “Is there anything else you can tell me?” “Yes,” he replied, “the sum of their ages is equal to the number of my house.” I stepped outside to see what the house number was. Upon returning inside, I said to my host, “I’m sorry, but I still can’t figure out their ages.” He responded apologetically, “I’m sorry, I forgot to mention that my oldest daughter likes strawberry shortcake.” With this information, I was able to determine all three of their ages. How old is each daughter?

How old they are? Click here! 

Source 

Calculation of The Ages of Three Daughters

How it was asked to find with some clues? 

The product of their age is 72; so possible combinations are,

3 x 3 x 8 = 72                       3 + 3 + 8 = 14

2 x 6 x 6 = 72                       2 + 6 + 6 = 14

2 x 2 x 18 = 72                     2 + 2 + 18 = 22

2 x 3 x 12 = 72                     2 + 3 + 12 = 17

2 x 4 x 9 = 72                       2 + 4 + 9 = 15

3 x 4 x 6 = 72                       3 + 4 + 6 = 13
 
If any of last 4 combinations was correct then I would have come to know ages of daughter straightaway as their sum is unique. So friend's house number as he must have told must be 14. That's why I was uncertain with the correct combination as they are appearing twice.

In next clue, he indirectly suggest he has only 1 oldest daughter. So 2,6,6 is eliminated as in that case he would have 2 oldest daughters.

So the correct combination is 3,3,8. That means he had oldest daughter of age 8 & younger twins.

250 Lbs Across The River?

Two boys weighing 50 pounds each and their older brother weighing 100 pounds wish to cross a river. Their boat will only hold 100 pounds.

How can they all cross the river in the boat?

Find here how they can! 

Source 

Taking 250 Lbs Across The River.

What was the challenge? 

1. First 2 boys of 50 pounds should cross the river.

2. One of them should bring back the boat at other end.

3. A boy with 100 pounds should carry himself across the river with boat.

4. Other boy of 50 pounds waiting across the river now should bring back the boat again.

5. Now both boys of 50 pounds now should cross the river. 

Which Door First?

While driving his car a man slams on the brakes when he sees, in the middle of the street, a diamond studded door, a gold door and a silver door. 

Which door does he open first?

Which door should I choose?

This should be first one! 

Source 

This Should Be First Door!

What's the situation? 

To open any other door he need to get out of the car & for that first he needs to open the door of the car.

"Thanks,You're Fired!"

A man is leaving on a business trip and stops by his office on the way to the airport. The night watchman stops him and says, "Sir, don't take that flight. I had a dream last night that your plane would crash and everyone would die!" The business man cancels his trip and sure enough, the plane crashes, killing all the passengers. The man gives his watchman a $10,000 reward for saving his life, then fires him. Why?

That's why! 

Source 

This Is Not Allowed On Duty

What exactly happened? 

The man awarded $10000 obviously for saving his life. The duty of night watchman is to keep watch on office at night not to sleep & dream.

That's why he fires the watchman.

Snail Up The Wall

A snail creeps 10 feet up a wall during the daytime, then falls asleep. It wakes up the next morning and discovers it slipped down 6 feet. If this happens each day, how many days will it take to reach the top of a 20 feet wall?

Escape to answer! 

Source 

A Snail On Top of The Wall !

Read the question first! 

Let's find out progress of snail day by day.

Day 1 : UP to 10, DOWN to 4

Day 2 : UP to 14, DOWN to 8

Day 3 : UP to 18, DOWN to 12

Day 4 : UP to 22 which is greater than 20.

So snail requires 4 days to reach the top of the wall.

The 500 Miles Race

Mike, Jimmy, Nader, Kevin and Larry were the top five finishers in the regional 500-mile race. They drove yellow, orange, green, red and blue cars but not necessarily in that order.

1. Neither Kevin nor Larry drove the green car.

2. Kevin finished faster than Mike and Larry.

3. The blue car finished earlier than Larry’s and Nader’s car.

4. The yellow car finished faster than the green car and the orange car.

5. Mike’s and Larry’s car finished ahead of the orange car.

6. Jimmy’s car finished before the blue and the yellow car.

Who drove what color car and what place did each driver finish?

To know that click here! 

Source 

Stats of The 500 Miles Race

Here is the scenario! 

Let's make a bit simple by putting clues into table. Rows representing owner while columns representing their cars. Now we need to use logical deduction by using all the clues & fill the table one by one. Finally, we get this.

Stats of The 500 Miles Race

 Filled circle represents rank of the particular car or participant. e.g. 1 circle means it's first, 2 means second & so on.

 

Losing Ten Minutes An Hour

A clock loses exactly ten minutes every hour. If the clock is set correctly at noon, what is the correct time when the clock reads 3:00pm?

Faulty Clock

Find it here!

Source 

Real Time Of a Faulty Clock

How much faulty it was? 

A clock loses 10 minutes in every hour that means for 60 real minutes it shows 50 minutes. In another words, real time is 60/50 = 1.2 times the minutes shown by the slower clock. It was set correctly at noon & at 3:00 PM ; 180 minutes of slower clock elapsed. That means the real time is 180 x 1.2 = 216. So it's 3:36 PM in real time clock!

Correct Time

'The Slowest Race' Brain Teaser

An Arab sheik is old and must will his fortune to one of his two sons. He makes a proposition. His two sons will ride their camels in a race, and whichever camel crosses the finish line LAST will win the fortune for its owner. During the race, the two brothers wander aimlessly for days, neither willing to cross the finish line.

In desperation, they ask a wise man for advice. He tells them something; then the brothers leap onto the camels and charge toward the finish line.

What did the wise man say?

This is what he said! 

Source 

Winning 'The Slowest Race'

Why was wise man asked? 


The wise man asked the brothers to switch camels. Now every brother tried

hard to make other brother's camel a winner! 

     Wise Man's Advice

Being Alive After Lift Crash Landing? - Puzzle

A lift is on the ground floor. There are four people in the lift including me.When the lift reaches first floor, one person gets in and three people get out.The lift goes up to the second floor, 2 people get out 6 people get in.It then goes up to the next floor up, no-one gets out but 12 people get in. Halfway up to the next floor up the lift cable snaps, it crashes to the floor.

Everyone else dies in the lift. How did I survive?

  
This is how did I! 

Escape from Crash Landed Lift

This was the incident. 

Read carefully once again, in journey from 1st to 2nd floor there are only 2 

people in the lift. At 2nd floor, 2 people get out that means it includes me   

as well. This is how I survived.

Selecting The Barbershop

A man is driving South to Florida for a vacation. On the way, he realizes that he needs a haircut, so he stops in a small town along the way. He asks one of the residents where he can find a barbershop, and the resident tells him that there are only two barbers in town, one in the north part of town and one in the south. The man visits the north barber, and finds that the barbershop is messy and the barber himself has a bad haircut. He then visits the south barber, who has a clean barbershop and a good haircut. 

However, the man decides to return to the north barber for his haircut. Why does he do this?

This is why he does so! 

Reason To Choose The North Barbershop

Here is the question! 

Since there are only 2 barbershops in town each barber has to go to each other for their haircut. So barber with good haircut must had it from the other barber at the north. Obviously, the man choose him to get a nice look. 

Bird's Journey From Train To Train

Suppose distance between SECUNDERABAD & CST is 1000 KM. Railway tracks are in straight lines with no curves in between.

A train with uniform speed of 100 kmph departs from CST at 9:00 AM. Same day on same track other train from SECUNDERABAD departs at 10:00 AM with uniform speed of 80 kmph.

A bird sitting on engine of train that departed from CST starts traveling toward the SECUNDERABAD & after touching the engine of that train travels back to CST train. A bird repeats this until trains collide.

How much distance the bird traveled & how many times did it travel to & fro? 

Click for the answer! 

Distance Traveled By The Bird

Here is the question! 

Let's divide answer in 2 parts.

1.Finding distance traveled by the bird.

The SECUNDERABAD train is one hour late till then CST train covers 100 km.

Hence effective distance is 900 km

Total speed of approach = 100 + 80 kmph

Total distance covered = 900 km

Time passed before trains collide = 900/180 = 5 Hours

Speed of bird = 120 kmph

Distance covered in 5 hours by bird = 120 * 5 = 600 km

Distance covered in first hour by bird = 120 km

Total distance = 600 + 120 = 720 km



2. Finding how many times bird traveled back & forth.


1st travel -

Total speed of approach = 120 + 80 = 200 kmph

Total distance to be covered = 900 km

Time required to meet each other = 900/200 = 4.5 Hours.
 
2nd travel -

Distance traveled by CST train in 4.5 hours = 100 x 4.5 = 450km

Distance traveled by SECUNDERABAD train in 4.5 hours = 80 x 4.5 = 360 km

Distance between 2 trains = 900 - (450+360) = 90 km

Time left for collision is 5 - 4.5 = 0.5 hrs.


So bird ends up with 1 complete round.

How To Reach The Island?

Abhijeet wants to reach an island which is in the middle of the river. The island is 30 feet from the edge of the river. As shown in the picture below he got two wooden planks about 29 feet each.

          How to reach there?

How can Abhijeet reach the island? 

1. This is how he reached!

Source 
 

Trick To Reach The Island.

Here is the task! 

A picture is worth thousands of words.

  Finally, reached there!

The Honest and Dishonest Guards

You’re in a room with two doors. There’s a guard at each door. One door is the exit, but behind the other door is something that will kill you. You’re told that one guard always tells the truth and the other guard always lies. You don’t know which guard is which. You are allowed to ask one question to either of the guards to determine which door is the exit. 

What question should you ask?

Exit door

Here is that question! 

Source 

Question to Find The Exit Door

What was the situation? 

What if I tell you that you have to ask only one question to anyone & choose the opposite door? Yes, be patient & read further.

Ask anybody this question.

"What would other guard answer if I ask him which one is exit door?"

Now there are two possibilities.

1. If the guard is truth telling then he knows other guard would lie & point the door leading towards the death. So he will point that door.

2. If the guard is lying then he knows other truth telling guard would have pointed right door.But in order to lie, he would point to opposite door! 

Six Glasses in a Row

There are six glasses in a row. The first three are full of orange juice, and the next three are empty. By moving only one glass how can you make them alternate between full and empty?

Make it alternate!

Here is solution!

Alternate Glasses in a Row

What was the riddle? 

All you need to do is pour 2nd glass into 5th one! It is as simple as that

one! See Below!

To make it alternate!

On a Mission of Fishing

Two fathers and their two sons go fishing together. They each catch one fish to take home with them. They do not lose any fish, and yet when they arrive at home they only have three fishes. 

How can this be?

This is how it can be! 

Source 

Three Generation On Mission

What's the matter? 

There are grandfather, father & grandson. So there are 2 fathers viz. father & grandfather while there are 2 sons viz. father & grandson! Three generations on the mission.

Three Generations

Which Coin is Counterfeit?

You are given eight coins and told that one of them is counterfeit. The counterfeit one is slightly heavier than the other seven. Otherwise, the coins look identical. Using a simple balance scale, how can you determine which coin is counterfeit using the scale only twice?

Identify The Fake Coin

  
This is how it can be found! 

Source 

To Identify The Counterfiet Coin!

Why it was asked to? 

1. Make a group of 3 coins each. Weigh these groups against each other.

2. If both groups weigh equal then weigh remaining 2 against each other. Heavier coin would be easily identified.

3. If one of group is heavier, then take out coins of this group.The counterfeit coin is among them.

4. Now weigh 2 of 3 coins of this group against each other.

5. If both are equal then obviously third one is counterfeit.

6. If one of them is heavier then obviously that one is counterfeit. 

 

The Safest Room - Lateral Thinking

A murderer is condemned to death. He has to choose between three rooms. The first is full of raging fires, the second is full of assassins with loaded guns, and the third is full of lions that haven't eaten in 3 years.

Which room is safest for him?

The Safest Room

Which one;find it here! 

Source 

The Safest Room - Lateral Thought

What was the puzzle?

If murderer has a little brain then he would choose the third room 

straightaway. How lions can stay alive for 3 years without eating anything? 

"He is my son"

A man and his son are in a terrible accident and are rushed to the hospital in critical care. The doctor looks at the boy and exclaims "I can't operate on this boy, he's my son!"

How could this be?



Here is that lateral thought! 

A Doctor Can Be Mother

Why it was required? 

The doctor is mother of that son!

Visual Illusions Psychology

Which monster looking bigger? The one which is chasing the other? Right?

Bigger Vs Smaller

Now look at this. What's your take now?

Equal Heights

Both are of same size. A 3D tunnel built around deceives your visual system & totally changes how it perceive things.

Now take a look at this. Are these straight lines or not? Definitely not! Right?

Straight or Curved

But you are totally wrong! Have a look at this.

Only Straight Lines

Again white & black checks surrounded in certain disorder changes how you perceive things.  

Checker Shadow illusion

Which square is darker here; A or B?

A is darker or B

The A appears darker than B here. But that's not the reality. Both shares equal levels of brightness & gray levels. A printer would you same ink to print those squares. 

Equally Darker

What's challenge to visual system here?

The task given to your visual system here is to determine the color of the object & here it is gray level. But shadow of cast plays here big role. The square under shadow reflecting less light than the one is not in shadow. Visual system need to do several tricks to compensate that shadow effect & determine the exact color of the square under shadow.

What tricks visual system uses?

1. Local contrast : Irrespective of shadow, a lighter check surrounded by more lighter checks is perceived as a check with more average lightness & vice versa. In the figure, the light check in shadow is surrounded by darker checks. Thus, even though the check is physically dark, it is light when compared to its neighbors. The dark checks outside the shadow, conversely, are surrounded by lighter checks, so they look dark by comparison.

2. Shadows often have soft edges while paints (here checks) have sharp edges. The visual system tends to ignore gradual changes in light level, so that it can determine the color of the surfaces without being misled by shadows. In this figure, the shadow looks like a shadow, both because it is fuzzy and because the shadow casting object is visible.

3. The "paintness" of the checks is aided by the form of the "X-junctions" formed by 4 abutting checks. This type of junction is usually a signal that all the edges should be interpreted as changes in surface color rather than in terms of shadows or lighting.
 
Conclusion :

The effect illustrates success rather than failure of our visual system. The illusion asking our visual system to act as a light meter; but it's definitely not built for it. What's the success of our visual system here is it breaks the information into meaningful components & then perceive different aspects of objects.



Courtesy : Wikipedia
 

Water Measurement With 2 Buckets - Puzzle

You have two buckets. One holds exactly five gallons and the other three gallons. How can you measure exactly four gallons of water into the five gallon bucket?

Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.

How to measure 4 gallons?

Click here to know how it could be done? 

Source 

Water Measured Using 2 Buckets - Puzzle Cracked

What was the challenge? 

Method 1 :

1. Fill up the 3 gallons bucket & pour into 5 gallons bucket.

2. Again fill the gallon bucket & once again pour it into 5 gallons bucket. After completely filling 5 gallons bucket there will be 1 gallon left in 3 gallons bucket.

3. Empty 5 gallons bucket.

4. Pour that 1 gallon into 5 gallons bucket. Now fill up 3 gallons bucket. We have 4 gallons of water now 1 in 5 gallons bucket & 3 in 3 gallons bucket.


Method 2:

1. Fill up 5 gallons bucket & pour it into 3 gallons bucket. 2 gallons would remain in 5 gallons bucket.

2. Pour that 2 gallons of water into 3 gallons bucket. Now only space for 1 gallon left in 3 gallons bucket.

3. Again fill up 5 gallons bucket & pour into 3 gallons bucket containing 2 gallons of water left. So only 1 gallon can be poured & 4 gallons would be remaining in 5 gallons bucket. 

 

3 Switches And 1 Light Bulb

You are standing outside a closed door. On the other side of the door is a room that has a light bulbs in it. The room is completely sealed off from the outside. It has no windows and nothing can get in or out except through the door. On the outside of the room there are three light switches that controlling light bulb on the other side of the door.

Your assignment is to determine which light switch controls that light bulb. You are allowed to enter the room only once and once you come out, you must be able to state with 100% certainty which light switch controls which light bulb.

Which controls bulb?

What should you do? 

Source 

The Control Switch of Bulb

What's the matter? 

Turn ON first light switch, wait a few minutes, then turn it OFF and turn ON the second light switch. Now go to the room, if bulb is ON then second switch is controlling it. If it's OFF, then touch it & if it feels warm then first switch which you had switched ON for a while. And if it isn't warm then definitely third switch controlling the light bulb.

The Dog in Trouble

A completely black dog was strolling down main street during a total blackout affecting the entire town. Not a single streetlight had been on for hours. As the dog crosses the center of the road a Buick Skylark with two broken headlights speeds towards it, but manages to swerve out of the way just in time.

How could the driver see the dog to swerve in time?

How did I survive?

Not that much difficult! 

Source