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

A B C D E F G H

These are the letters given to you. Now you have to find out the letter that comes two to the right of the letter which is immediately to the left of the letter that comes three to the right of the letter that comes midway between the letter two to the left of the letter C and the letter immediately to the right of the letter F.

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

When it is alive we sing, when it is dead we clap our hands. What is it?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Count the number of triangles in the picture below:

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

Count the number of balls in picture below: