Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What number when divided in half becomes zero?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

What will you call your mother's brother's brother-in-law?

Three cars are driving on a track that forms a perfect circle and is wide enough that multiple cars can pass anytime. The car that is leading in the race right now is driving at 55 MPH and the car that is trailing at the last is going at 45 MPH. The car that is in the middle is somewhere between these two speeds.
Right now, you can assume that there is a distance of x miles between the leading car and the middle car and x miles between the middle car and the last car and also, x is not equal to 0 or 1.
The cars maintain their speed till the leading car catches up with the last car and then every car stops. In this scenario, do you think of any point when the distance between any two pairs will again be x miles i.e. the pairs will be x distance apart at the same time ?

Where do you go to learn how to make ice cream?

Replace the question mark with the correct number in below Picture: