The centre of the third figure is empty. What digit should fit inside?

What is the Surname of Barbie Doll?

Can you make a six-letter word using the letters N, A and B ?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

How many letters are in the alphabet?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.