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

What is black when you buy it, red when you use it, and gray when you throw it away?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Can you find out who is the kidnapper in below Picture and why, Explain ?

Can you identify if it's a murder or a suicide ?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?

By using all numbers, i.e. 123456789 and subtraction/addition, operators number 100 can be formed in many ways.
Example: 98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100

But if we add a condition use of the number 32 is a must. Then there are limited solutions.
One of such solution is: 9 - 8 + 76 + 54 - 32 + 1 = 100

Can you tell me any other solution?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.