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

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

The Federal bank of London is abducted by the robbers. The head of the robbers asked the cashier to empty their money vault to them and when suddenly cashier got a call from her father. To avoid any suspicion, the robber asked the cashier to pick the call and reply her father in the shortest manner possible.

The cashier told her father "Is there an emergency father, Call me when you are free and I will help you in your furnishing" and then the cashier hung up the phone.

After 10 minutes, police arrived at the crime scene.

How did the police know about the robbery?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

What is always in front of you but can’t be seen?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Can you count the number of triangles in the given picture?

Can you solve the below geography rebus by decoding the below rebus ?

What does this below rebus puzzle mean?