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

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

A man is sitting in a bar when a rich man sits next to him. He turns to the rich man and says, “Did you know I know almost every song that has ever existed?”

The rich man laughs. The man then says, “I bet you all the money you have in your wallet that I can sing a genuine song with a lady’s name of your choice in it. The rich man laughs again and says, “OK, how about my daughter’s name, Jamie Armstrong-Miller?” Minutes later, the man collects his cash and the rich man goes home cashless. What song did the man sing?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Select from the four options below!

a) Geneva, Switzerland
b) New York City, USA
c) Paris, France
d) London, England

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

How can a man go eight days without sleep?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?