What does it mean?

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

Find
6 * 5 * 4 = ?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

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.

Count the number of squares in the picture below.

What is the coolest letter in the alphabet?

If eleven plus two equals one, what does nine plus five equal?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What does a man do only once in his lifetime, but women do once a year after they are 29?