It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

Why do you find that most of the buildings are deprived of the 13th floor?

Can you count the number of matches in the picture below ?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

What number when divided in half becomes zero?

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

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?