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.

Can you write down eight eights so that they add up to one thousand?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

A woman is sitting in her hotel room and hears a knock at the door. She opens the door to see a man whom she’s never met before. He says, “I’m sorry, I have made a mistake, I thought this was my room.” He then goes down the corridor and into the elevator. The woman goes back into her room and calls security. What made the woman so suspicious of the man?

Why is 6 afraid of 7?

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

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?

What is full of holes but still holds water?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?