Find the next number in the series below

21 32 54 87 131 ?

What's the only room from which no one can enter or leave

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?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

During which month do people sleep the least?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

Which letter of the alphabet has the most water?

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

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?