Imagine you are in a big house and you need to match out the 3 switches located in the first floor with the three light bulbs located in the ground floor. In the ground floor there are 3 bulbs (all are off at the moment), each switch belongs to some bulb.

Question

How can you find out, which switch belongs to which bulb?

Other conditions

It is impossible to see from one room to another.

He can only get down only once to check out the bulb.

Only hands are used. No other device.

Leave your answers below as comments.

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1. If 3 cats kill 3 rats in 3 minutes, how long will it take 100 cats to kill 100 rats?
2. Is it legal for a man to marry his widow’s sister?
3. A monkey is at the bottom of a 30-foot well. Each day he jumps up 3 feet and slips back two. At that rate when will the monkey reach the top of the well?
4. I have 2 minutes to catch a train and 2 Km to go. If I go the first Km at the rate of 30 Km per hour, at what rate must I go the second Km in order to catch the train?
5. The number of eggs in a basket doubles every minute. The basket is full of eggs in an hour. When was the basket hall full?
6. What is the smallest number of ducks that could swim in this formation: two ducks in front of a duck, two ducks behind a duck and a duck between two ducks?
7. A boat will carry only 200 pounds. How a man weighing 200 pounds and his two sons, each of whom weighs 100 pounds, use it to cross a river?

Leave your answers below as a comment.

Online masters degree programs are available for those who want to learn advanced math skills.

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A man on a park bench is looking at a small portrait. You ask him, Who is that in the picture?
The man says, Brothers and sisters, I have none, but that man's father, is my father's son.
Can you tell what person is in the picture?

A beggar's brother died, but the man who died had no brother. How could this be?

Leave your answers below as comments. If you have more such puzzles based on family relationships, post them as comments below.

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How to get the heritage?

An Arab sheikh tells his two sons to race their camels to a distant city to see who will inherit his fortune. The one whose camel is slower will win. The brothers, after wandering aimlessly for days, ask a wise man for advise. After hearing the advice they jump on the camels and race as fast as they can to the city. What does the wise man say?

Post a comment below with your answer.

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In this post I am presenting 3 such interesting puzzles. Keen observation and simple application of logic is required to solve them. So here you go -

1. Make this equation valid with single stroke of pen (i.e. just by adding a line somewhere): 5+5+5 = 550
2. Make 120 using 5 zeros. You can use any mathematical notation/symbol
3. What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller

Leave your answers as comment under this post.

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Your grandfather, determined to start the year 1900 off right, went to bed at 7 p.m. on December 31, 1899, setting his alarm clock to wake him at 8 the next morning. He slept like a log. How many hours sleep did he get?

Ancient Coin Puzzle

A thief went to a shop that sold antique coins. He stole a coin from Emperor Alexander’s time that had 326 B.C. inscribed on it. These rare coins were worth $ 100 for every year of their age (years from date of minting till now). So how much did the thief get for his stolen coin?

Both the puzzles above have some similarity. There is a clue hidden in the title of the post itself.

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Three friends check into a hotel. They pay $30 to the manager and go to their room. The manager suddenly remembers that the room rate is $25 and gives $5 to the bellboy to return to the people.  On the way to the room the bellboy reasons that $5 would be difficult to share among three people so he pockets $2 and gives $1 to each person. Now each person paid $10 and got back $1. So they paid £9 each, totalling $27. The bellboy has $2, totalling $29.

Where is the missing $1?

leave your answers below.

The above  missing dollar riddle is a famous problem that illustrates problems of confusion and misdirection in conversation. It illustrates how misdirection and irrelevant facts and questions can foil a person's clear understanding of a problem. Apply your mind and explain the logic behind the missing dollar.

Follow-up to the above problem - An interesting resolution is often cited as the solution to the above problem. Just read the following paragraph and post a comment whether you agree or not the given resolution to the above mystery.

A few months later, two of the original three guests check into a hotel room in the same hotel. The clerk says the bill is $20, so each guest pays $10. Later the clerk realizes the bill should only be $15. To rectify this, he gives the bellhop $5 to return to the guests. On the way to the room, the bellhop realizes that he cannot divide the money equally. As the guests didn't know the total of the revised bill, the bellhop decides to just give each guest $1 and keep $3 for himself.

Now that each of the guests has been given $1 back, each has paid $9, bringing the total paid to $18. The bellhop has $3, so $18 + $3 = $21, and the guests originally handed over $20, so that's where the missing dollar from the original problem is!

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Timing Puzzle 1
Having 2 sand-glasses: one 7-minute and the second one 4-minute. How can you time correctly 9 minutes ?

Timing Puzzle 2
A teacher of mathematics used an unconventional method to measure a 15-minute time limit for a test. He just used 7 and 11-minutehourglasses. During the whole time he turned sandglasses only 3 times (turning both hourglasses at once count as one flip).

Explain how the teacher measured 15 minutes.

Leave your answers below

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3 Full, 3 Empty Glasses Puzzle

Visualize six drinking glasses in a row: the first three full of water, the next three empty. Please refer to the image below. Touching only one glass, can you arrange it so that no full glass stands next to another full one, and no empty next to another empty?

You have to tell a way in which this can be done. Leave your answers below. To share this on facebook, click on the like button.

I am happy to inform you through this post that QuickerMaths.com has reached to 4000 subscriber in short time span. It's all because of your continued support.  Thanks a lot

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During the latest round of a game, Kamal was fourth. Ramesh is not the oldest, but is older than Sujan, who was not second. The child who was next in age to the youngest, finished second. The child who finished in third place is older than the child who finished first. Bimal is younger than the child who finished in third place. Can you determine who finished where and place the children in order of age?

Leave your answers below -

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