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.

Find the missing letter in the last circle logically in the given below picture.

If it took eight men ten hours to build a wall, how long would it take four men to build it?

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

How many Watermelons are there in the below picture?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Chocolate costs 6 rupees and a Toy costs 5 rupees. If you have 32 rupees in total, how many chocolates and how many Toys can be purchased with that amount?

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

What word begins and ends with an E, but has only one letter?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?