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

Solve the equation in the image by looking at the pattern closely.

It is a 5 letter word if you take away first letter it is something you get from sun, if you remove second letter you will get something to eat, if you remove third letter you get a word you use in pointing at and if you remove the fourth letter you get something to drink. What is it?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

John is looking at Jenifer, but Jenifer is looking at Jacob. John is married, but Jacob is not.

Is a married person looking at an unmarried person ?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

I have an eye but still cannot see.

Who am I?

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

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?