Can anyone tell me a word in the English dictionary which has a silent 'z'?

Can you count the number of triangles inside a triangle?

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

What is the largest number you can write with just 3 digits?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

What work can one never finish?

Give it food and it will live; give it water and it will die.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

I make two people out of one. What am I?

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

Who am I?