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

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

You need to move three matchsticks to form three squares. Can you do it?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

If you say my name, I will no longer exist. What am I?

I have Rs.50 and I spend it in the way as below.

What always comes into a house through the keyhole?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

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

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?