I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

I have feet, but no legs. Which animal Am I?

Why do you find that most of the buildings are deprived of the 13th floor?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Can you write down eight eights so that they add up to one thousand?

100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?