What work can one never finish?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

What demands an answer, but asks no questions

Using eight eights and addition only, can you make 1000?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Move four matchsticks to the below square to form three squares?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Can you solve the photo plexer logic ?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?