Here is a mathematical expression that also secretly tells a movie name. What movie is that?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Solve the mathematical equation in the picture below.

John is the son of Jacob.
So,
Jacob is the_____of John's father?

What always comes into a house through the keyhole?

A boy was driving a car, a girl took a lift from her. She asked his name. The boy said - my name is hidden in my car’s number, find it if you can. After this, she got down Car number was [ WV733N ] Can you guess the name now?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?