As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

Queen Elizabeth organised a royal party.

To Avoid uninvited guest royal family set a password.
Jack (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Jack thought is enough and he walked to the entry point. The security person said 'eight' , Jack replied smilingly 'four'.
He was immediately thrown out of the party. why ?

How can you tell a raw egg from a hard-boiled egg?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

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?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

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