81 x 9 = 801. What must you do to make the this equation true?

Which tank will fill first?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

What do you see in the given picture?

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?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

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

The chance of Mr John winning the lottery is 10%. All participants lined up and Mr John is 4th in the row. The first three participants lose the lottery.

What is the chance of Mr John now?