If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Out of three Friends John, Jacob and Jonny one of them is a king, one is a bureaucrat, and one is a Spy.

The king always tells the truth, the bureaucrat always lies, and the Spy can either lie or tell the truth.

John says: Jonny is a bureaucrat
Jacob says: John is a king
Jonny says: I am a Spy

Tell me, Who is the king, who is the bureaucrat, and who is the Spy?

John can fit six large chocolate boxes or nine small chocolate boxes into a carton. How many cartons will he require to put sixty-six chocolate boxes into?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

How many times can you subtract the number two from the number fifty?

I taste better than I can smell. Who am I?

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

I am white when I am dirty, and black when I am clean. What am I?