What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

You need to move three matchsticks to form three squares. Can you do it?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?

There was a strange boy who was born before his father. How can this be possible?

In the picture given below, can you find out which digit will take place of the question mark?

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?