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?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

If eleven plus two equals one, what does nine plus five equal?

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

I travel all around the world but always stay in the corner. What am I?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?