I have eight fingers and two thumbs but I do not live. What Am I?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

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.

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Through your logical capabilities, can you make 7 an even?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

It is always ahead of me yet I can never see it. What is it?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

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

Take one out and scratch my head, I am now black but once was red. What am I?