Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

It is always ahead of me yet I can never see it. What is it?

What building has the most stories?

John is found dead in his office at his desk. The police have narrowed the suspects down to three people: Mrs. Jacob, John’s wife Hena and his business partner Jason . All three visited John on the day of his murder, but all three provide the police with stories of explanation as to the reason for their visit.
Police found John with his wrist watch still on his right arm, a torn up picture of his wife laying on the floor beside the trash can, and an ink pen in his right hand. On the desk, the police found a name plate, a telephone that was off the hook, and a personal calendar turned to the July 5th page with 7B91011 written on it. After examining this evidence, the police knew their suspect. Who was it ?

What jumps when it walks and sits when it stands?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?