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

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

Which number comes next in the number series?

2, 9, 30, 93, ?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

who is silent in the parliament?

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

What work can one never finish?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?