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

What has a ring but no finger?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

When can we add 2 to 11 and get 1 as the correct answer?

What do you see in the given picture?

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Can you move 2 matchsticks to form four equal sized squares.