what does the below math rebus puzzle mean?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

It belongs to you, but other people use it more than you do. What is it?

You need to move three matchsticks to form three squares. Can you do it?

Can you identify if it's a murder or a suicide ?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside. The man said, "Oh! I am really sorry, I thought this was my room." He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man. What made her suspicious of that man? He might have been genuinely mistaken.

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

How can a man go eight days without sleep?