What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

What is the fastest way to double your money?

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

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?