Sort by:
Most PopularAll puzzles
|
5
5
Interview Question - Databases
This is a common interview question at companies like Google and Amazon:
“Explain a database in three sentences to your eight-year-old nephew.”
This question has an infinite number of solutions. Fee
...
|
Doable
|
|
3
1
The Tallest Mountain
A man approaches you with a very enigmatic look on his face. He asks your for a bit of your time and if you could answer a quick question for him. He asks: “Before Mt. Everest was discovered, which w
...
|
Easy
|
|
1
1
The Middle of Nowhere
What is in the middle of "nowhere"?
The answer is indisputable, and not based on some philosophy.
|
Easy
|
|
3
2
Products Algorithm
Given an array A[1...N] of integers, create an array O[1...N] where O[i] = the product of all elements in A except for the ith element.
For example, if N = 3, and A = {6, 4, 2}, O = {8, 12, 24}
The t
...
|
Doable
|
|
4
2
Betsy and Patsy
“We were born on the same day of the same year,” said Betsy.
“And we have the same mother and father,” said Patsy.
“But we’re not twins!” the two exclaimed.
Can you explain?
|
Doable
|
|
6
All Apples
On the market, mrs. Jones and mrs. Smith sell apples. Mrs. Jones sells her apples per two for 0.50 euro. The apples of Mrs. Smith are a bit smaller; she sells hers per three for 0.50 euro. At a certa
...
|
Doable
|
|
2
6
Find the Missing Number
In this table, each row across follows the same pattern of numbers. See if you can discern the pattern and fill in the missing number in the bottom row.
7 4 8
3 9 7
6 5 10
?
...
|
Doable
|
|
4
4
Electrical Deaths
You and your friend are driving out in the pouring rain one night. It soon becomes much to hard too see, so you stop at closest house possible. When you knock on the door, an old lady welcomes you to
...
|
Easy
|
|
5
Attic Lamp Switch
A downstairs panel contains three on-off switches. One of them controls the lamp in your attic. Using only ONE trip up to the attic, how do you determine which switch controls the lamp?
|
Doable
|
|
6
2
Burning Rope
There are two lengths of rope.
Each one can burn in exactly one hour.
They are not necessarily of the same length or width as each other.
They also are not of uniform width (may be wider in middle th
...
Submitted by Ravi
|
Doable
|
|
5
Measuring Up
You have a 3 and a 5 litre water container, each container has no markings except for that which gives you its total volume. You also have a running tap. You must use the containers and the tap in su
...
|
Doable
|
|
7
Mutilated Chessboard Problem
Suppose a standard 8×8 chessboard has two diagonally opposite corners removed, leaving 62 squares. Is it possible to place 31 dominoes of size 2×1 so as to cover all of these squares?
|
Hard
|
|
3
4
The Famous Hole in a Sphere
This incredible problem was first made famous by Martin Gardner with his ‘Mathematical Games’ column published in Scientific American throughout the 60s and 70s.
A cylindrical hole, 6 inches long,
...
|
Doable
|
|
4
The bus stop
You’re driving your car to work in the pouring rain when you see three people on the side of the road at an uncovered bus stop. You recognize one as your best friend waiting to go to work, the second
...
Submitted by Aakash
|
Doable
|
|
3
2
The Female Star
My first two letters are a man. The first three a woman. The first four are a brave man. And in whole I am a brave woman.
|
Doable
|