Replace the question mark with the correct number below.

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Move four matchsticks to the below square to form three squares?

Before Mount Everest was discovered, what was the highest mountain in the world?

I shave every day, but my beard stays the same. What am I?

A woman shoots her husband.

Then she holds him under water for over 5 minutes.

Finally, she hangs him.

But 5 minutes later they both go out together and enjoy a wonderful dinner together.

How can this be?

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

John was a very careless driver, so his owner Jacob gave him an offer that he will get an incentive of Rs.30 for every bottle box he delivered without breaking it and he will be charged Rs.90 for every bottle box he broke. Jacob gave John 100 bottles-box to deliver. After delivery, Jacob paid John Rs.2400. How many bottles-box did John break?

A father's child, a mother's child, yet no one's son.

Who am I?

Which is the smallest number that you can write using all the vowels exactly once?