Can you make four (4) nines (9) equal 100?

There was a kingdom in which the king had no heir to take over his thrown. Even the queen was dead and he himself was on the verge of dying. He thought about it and then summoned all of the teenagers. He gave one seed each to all of them and asked them to grow the plant. He announced that the one with the most beautiful plant will become the king/queen of the empire after the death of the king.

After a month, all of them were called. The king looked at all of the plants but announced the girl with an empty pot as the queen of the empire. Why?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

What is the centre of gravity?

How many times can you subtract the number two from the number fifty?

How many triangles can you count in the figure given?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

John was drowned by he was not wet. How?

What has a ring but no finger?