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?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

why number 8549176320 is one of a kind?

Five teams were competing in cricket where they faced each other exactly once. After the tournament, the following is the point table.

DareDevils 6
SuperKings 5
Royals 4
Sunrisers 2
Riders ?

How many points did Riders end up with?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

What is the next shape from answers A, B, C, and D figure?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?