There was a strange boy who was born before his father. How can this be possible?

What does this below rebus puzzle mean?

What does the below mathematical rebus mean?

You can see it everyday, But cannot touch it at will. What is it?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Can you make the number 24 by utilizing the numbers 1, 3, 4 and 6? You must use one number only one time and you can use mathematical operation symbols anytime anywhere.

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

Find the missing number in the image below.

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?