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?

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

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

If your uncle’s sister is not your aunt, what relation is she to you?

Which wheel of car does not rotate when you turn your car right?

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

Do you know what I am?

What is the next number in this series?

4,12,84,3612....

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

Can you name some countries which do not have the alphabet 'A' in them?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?