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.

our enemy challenges you to play Russian Roulette with a 6-cylinder pistol (meaning it has room for 6 bullets). He puts 2 bullets into the gun in consecutive slots, and leaves the next four slots blank. He spins the barrel and hands you the gun. You point the gun at yourself and pull the trigger. It doesn't go off. Your enemy tells you that you need to pull the trigger one more time, and that you can choose to either spin the barrel at random, or not, before pulling the trigger again. Spinning the barrel will position the barrel in a random position.

Assuming you'd like to live, should you spin the barrel or not before pulling the trigger again?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

If 21x = 79x, what is the value of x?

The answer I give is yes, but what I mean is no. What was the question?

By using 'because' continuously three times, can you make an English statement ?

Replace the question mark with the correct number below.

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Imagine you are in a room with no windows or doors. How will you get out?

What is the riddle which can be asked all day with a different correct answer each time.