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

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

What happened when the wheel was invented?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

In a family supper, a grandfather, a grandmother, two fathers, two mothers, four children, three grandchildren, one brother, two sisters, two sons, two daughters, one daughter-in-law, and one mother-in-law need to sit at a table.

There are only seven chairs available at the place. How many more chairs do they have to borrow so that everyone can sit down together for the suppers if everybody requires a separate chair?

A man is approaching a broad and barren land. He has a package with him. If somehow, he is unable to open the package before reaching the land, he will die.

Can you guess what is present in the package?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?