13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

What will you call your mother's brother's brother-in-law?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

What does below pictogram mean?

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

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What is the centre of gravity?

What can you see in the middle of March and April that you can never see in any other month?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

A police officer was passing by when he saw a guy hiding. He walked up to him and genially asked, "What is your name?"

"Shut up!" the boy responded.

"Where are your manners?" asked the outraged police officer.

"Up that tree," said the boy discourteously, directing to a neighbouring tree.

You're looking for trouble, aren't you?" said the police officer.

"No, trouble is looking for me!" the boy answered solemnly.

Why is the boy behaving like this?