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?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

A man dies of old age on his 25 birthday. How is this possible?

You visit a home for specially-abled children on the occasion of Christmas where you meet with 50 children. You have a box of chocolates containing 50 chocolates exactly.

What if you were asked to one chocolate to each child in a manner that one chocolate still remains in the box? Is it possible?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

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

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