One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

I add 5 to 9 and get 2. The answer is correct, so what am I?