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

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?

When we see 2 but call 10?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

What can jump higher than a building?

What do you get if you add 2 to 100 four times?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?

Using eight eights and addition only, can you make 1000?

A father's child, a mother's child, yet no one's son.

Who am I?