Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

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

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

A man was found murdered on Sunday morning. His wife immediately called the police. The police questioned the wife and staff and got these alibis: The Wife said she was sleeping. The Cook was cooking breakfast. The Gardener was picking vegetables. The Maid was getting the mail. The Butler was cleaning the closet. The police instantly arrested the murderer. Who did it and how did they know?

Why is a river so rich ?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

There are two words one resembles the "state of rest" and the other is related to "writing/reading material".

Can you name these two words which also sound similar?

Be active and find the killer in the picture Riddle below.