Replace the question mark with the number below given a simple math problem.

What is the riddle which can be asked all day with a different correct answer each time.

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?

Why is Saturday stronger than Monday?

If 2 workers can complete painting 2 walls in exactly 2 hours.

How many workers would be needed to paint 18 walls in 6 hours?

Find the next number in the sequence

5 12 24 36 ?

Can you find out the number that should replace the question mark with a valid reason?

Can you fill the blank with the correct number?

6 30 870 756030 _____

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

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?