Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

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?

How do you go from 98 to 720 using just one letter?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

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?

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?