Why do we preferably have round manhole covers and not square ones?

A man desired to get into his work building, however he had forgotten his code.
However, he did recollect five pieces of information
* Fifth number + Third number = 14
* The fourth number is one more than the second number.
* The first number is one less than twice the second number.
* The second number and the third number equals 10.
* The sum of all five numbers is 30.

What is the code ?

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?

Where do fish keep their money?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

What work can one never finish?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

What is the riddle which can be asked all day with a different correct answer each time.

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?