How can you write nineteen in a manner that if we take out one, it becomes twenty?

Can you place three balls such that the equation shown in the picture holds true?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

Can you find the thief by just looking at the picture below?

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 fill the blank with the correct number?

6 30 870 756030 _____

Can you move 2 matchsticks to form four equal sized squares.

What question can you never answer yes to?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?