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

A dead body is found outside a multi-story multinational company. The case is reported and a homicide detective is called on the crime scene.

He looks at the body and then towards the building. From the position of the body, it is evident that the victim committed suicide. He goes to the first floor of the building and then walks in the direction of the dead body, opens the window and toss a coin in the air.

He goes to second floor and again repeats the process. He keeps doing this till he is done on all the floors. Then he returns back to the floor and tells his team that it is a murder.

How in heaven did he deduce that?

What is the next number in this matchsticks series riddle?

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

I’m tall when I’m young, and I’m short when I’m old. What am I?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

If a wheel has 54 spokes, how many spaces are there between the spokes?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

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