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

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

With the help clues provided in the image, can you find the 5 digit key?

Can you move 2 matchsticks to form four equal sized squares.

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

What can go through glass without breaking it?

An ape is trying to climb on a pole that is 60 feet high. Due to the slippery surface, the ape climbs 3 feet in a minute only to slip back 2 feet.

How much time do you think the monkey will take to reach the top of the pole?

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag