• # Brain Teasers & Puzzles

Questions Per Page:
• We all know that the hour hand and the minute hand on a clock travel at different speeds. However there are certain occasions when the hands are exactly opposite each other. Can you give a simple formula for calculating the times of these occasions?

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• 3501 views

• While visiting a small town in the United States, I lost my overcoat in a bus. When I reported the matter to the bus company I was asked the number of the bus. Though I did not remember the exact number I did remember that the bus number bad a certain peculiarity about it. The number plate showed the bus number as a perfect square and also if the plate was turned upside down.? the number would still be a perfect square—of course it was not?
I came to know from the bus company they had only five hundred buses numbered from 1 to S00.
From this I was able to deduce the bus number. Can you tell what was the other number

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• 6024 views

• All the nine digits are arranged here so as to form four square numbers:
9, 81, 324, 576
How would you put them together so as to form a single smallest possible square number and a single largest possible square number?

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• 2494 views

• A friend of mine runs a bicycle shop and he narrated to me this following story:
A man, who looked like a tourist, came to his shop one day and bought a bicycle from him for Rs. 350. The cost price of the bicycle was Rs. 300. So my friend was happy that he had made a profit of Rs. 50 on the sale. However, at the time of settling the bill, the tourist offered to pay in travellers cheques as he had no cash money with him. My friend hesitated. He had no arrangements with the banks to encash travellers cheques. But he remembered that the shopkeeper next door had such a provision, and so he took the cheques to his friend next door and got cash from him.
The travellers cheques were ^11 made out for Rs. 100 each and so he had taken four cheques from the tourist totalling to Rs. 400! On encashing them my friend paid back the tourist the balance of Rs. 50.
The tourist happily climbed the bicycle and pedalled away whistling a tune.
However, the next morning my friend’s neighbour, who had taken the travellers cheques to the bank, called on him and returning the cheques which had proved value-less demanded the refund of his money. My friend quietly refunded the money to his neighbour and tried to trace the tourist who had given him the bad cheques and taken away his bicycle. But the tourist could not be found.
How much did my friend lose altogether in this un-fortunate transaction?

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• 3107 views

• On Bagshot Island, there is an airport. The airport is the homebase of an unlimited number of identical airplanes. Each airplane has a fuel capacity to allow it to fly exactly 1/2 way around the world, along a great circle. The planes have the ability to refuel in flight without loss of speed or spillage of fuel. Though the fuel is unlimited, the island is the only source of fuel.
What is the fewest number of aircraft necessary to get one plane all the way around the world assuming that all of the aircraft must return safely to the airport? How did you get to your answer?

Notes:
(a) Each airplane must depart and return to the same airport, and that is the only airport they can land and refuel on ground.
(c) The time and fuel consumption of refueling can be ignored. (so we can also assume that one airplane can refuel more than one airplanes in air at the same time.)
(d) The amount of fuel airplanes carrying can be zero as long as the other airplane is refueling these airplanes. What is the fewest number of airplanes and number of tanks of fuel needed to accomplish this work? (we only need airplane to go around the world)

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• 25755 views

• 4, 6, 12, 18, 30, 42, 60, 72, 102, 108, ?, ?, ?

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• 2570 views

• 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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• 2819 views

• Outside a room there are three light switches. One of switch is connected to a light bulb inside the room.
Each of the three switches can be either ‘ON’ or ‘OFF’.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb ??

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• 6126 views

• On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kitten, cats, sacks, wives. How many were going to St. Ives?

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• 2424 views

• Two old friends, Jack and Bill, meet after a long time.

Jack: Hey, how are you man?
Bill: Not bad, got married and I have three kids now.
Jack: That’s awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool… But I still don’t know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh now I get it.

How old are Bill’s kids?

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• 2241 views

• ## More puzzles to try-

• ### K=1! +2! +3! …+25!. What would be the last digit of K?

K=1! +2! +3! …….+25! What would be the last digit of K?Read More »
• ### People finger riddle

Assuming that there are nearly 7,000,000,000 (7 billion) people on Earth, estimate the size of number you’d get if you ...Read More »

• ### Which box did you open and how can you be sure to label all boxes correctly?

There are three boxes, one contains only apples, one contains only oranges, and one contains both apples and oranges.  The ...Read More »
• ### How old did he live to be?

A man was born on January 1st, 23 B.C. and died January 2nd, 23 A.D. How old did he live ...Read More »
• ### Married many but has no wife riddle

He has married many but has never been married. Who is he?Read More »
• ### Three number series puzzle

Can you find the next three numbers in the given series? 4, 6, 12, 18, 30, 42, 60, 72, 102, ...Read More »
• ### Easy but tricky math riddle

Can you solve this? 2 = 5 3 = 12 4 = 28 5 = ??￼Read More »
• ### Find the survivor

100 people standing in a circle in an order 1 to 100. No.1 has a sword. He kills next person ...Read More »
• ### Disney land Racing Puzzle

Doremon organized a race in which Schinchen, jerry, Oggy, and Nobita have participated. The results of the race is as ...Read More »
• ### Children and light switches

A room has 100 light switches, numbered by the positive integers 1 through 100.  There are also 100 children, numbered ...Read More »
• ### Counting Legs of Animals in zoo Puzzle

A Leopard has four legs, a spider has eight legs and a cricket has six legs. The total number of ...Read More »
• ### Ballon tragedy Riddle

One sunny afternoon, three men go for a ride on a hot air balloon over the Thar desert. After two ...Read More »
• ### How do you get out alive?

Imagine you are swimming in the ocean and a bunch of hungry sharks surround you. How do you get out ...Read More »
• ### Hot but Cold Riddle

I am hot but if you remove first two alphabets then I will become really cold. Who am I ?Read More »
• ### What is the value for ‘?’

Find the replacement value for “?” Hint  1   – Start and finish at ”?” (it’s about results); Hint  2  – ...Read More »
• ### Manage Symbol Riddle

Manage the mathematical symbol or brackets to solve this puzzle 2 (2 2)) 2=9Read More »
• ### How can you get across the moat?

You are surrounded by a 100 foot wide and 100 foot deep moat. You have a 40 foot tall ladder, ...Read More »
• ### Confidential mail puzzle

X wants to send a Confidential message to his friend Y in the mail. But Z (X’s Friend), who X ...Read More »
• ### Death in a Field

A man is lying dead in a field. Next to him there is an unopened package.  There is no other ...Read More »