Can you divide the below-given shape into four equal and identical pieces?

Considering the below equation:

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

Then, I + II + III = ?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

A sundial has the fewest moving parts of any timepiece. Which has the most?

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

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

French Police inspects a room where there are no windows, no doors, no tables and is almost empty expect there is just a puddle of water. They found a dead man who obviously hung herself from the ceiling, but they are not able to figure out how this had happened.

John and Jacob entered the crime scene and easily able to solve the case.

How did the man die?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

What has 13 hearts but no other organs?