What is the fastest way to double your money?

Find out the missing number in the picture attached:

Why 1729 is a magic number? Answer Logically.

What jumps when it walks and sits when it stands?

What does the below rebus riddle means?

Which wheel of car does not rotate when you turn your car right?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

What has hands, but can’t clap?

How can you take 2 from 5 and leave 4?

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.