If it took eight men ten hours to build a wall, how long would it take four men to build it?

Can you count the number of matches in the picture below ?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

How many squares, of any size, can you find on this chessboard which do not contain a Rook?

What can go up a chimney down, but can’t go down a chimney up?

What goes up but never comes down?

What phrase is represented by the Rebus

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?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.