People put me on the table and cut me but do not eat me. What am I?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

My location can be determined by the below rebus.
So where am i ?

How many letters are in the alphabet?

I am white when I am dirty, and black when I am clean. What am I?

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?

The dirtier I get, the whiter I look. Who am I?

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

What does the below rebus puzzle mean?