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

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Our product and our sum always give the same answer. Who are we?

I don't get anymore wetter, no matter how much rain falls on me.

our enemy challenges you to play Russian Roulette with a 6-cylinder pistol (meaning it has room for 6 bullets). He puts 2 bullets into the gun in consecutive slots, and leaves the next four slots blank. He spins the barrel and hands you the gun. You point the gun at yourself and pull the trigger. It doesn't go off. Your enemy tells you that you need to pull the trigger one more time, and that you can choose to either spin the barrel at random, or not, before pulling the trigger again. Spinning the barrel will position the barrel in a random position.

Assuming you'd like to live, should you spin the barrel or not before pulling the trigger again?

Can you replace the question mark with the correct number in the below table sequence?

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

One night, a man runs away from home. He turns left and keeps running. After some time he turns left again and keeps running. Later, he turns left one more time and runs back home—but when he gets home, he finds a man in a mask. Who was the man in the mask?