A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

What month of the year has 28 days?

If you say my name, I will no longer exist. What am I?

If six children and two dogs were under an umbrella, how come none of them got wet?

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

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

Can you write down eight eights so that they add up to one thousand?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?