I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

Replace the question mark in the picture below.

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

This is a picture puzzle. You have to guess the name of the movie that can be related to the picture.

Identify the movie name through below Rebus containing Pi Mouse and coconut tree..

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

Find the hidden tiger in the given optical illusion ?

John was piloting a plane behind a car but was never able to overtake it. Why?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?