Can you place six X (crosses) in below board without making three in a row in any way ?

What does it mean?

Solve below rebus puzzle?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Which number should replace the question mark?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

What is the next number in this matchsticks series riddle?

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

Can you name some countries which do not have the alphabet 'A' in them?

With the help clues provided in the image, can you find the 5 digit key?