When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Mr Black, Mr Gray, and Mr White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr Black, who hits his shot 1/3 of the time, gets to shoot first. Mr Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr Black, where should you shoot first for the highest chance of survival?

What jumps when it walks and sits when it stands?

What does a man do only once in his lifetime, but women do once a year after they are 29?

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

I am quite hot but become too cold if you remove the first two letters. What am I?