Why is it against the law for a man living in Delhi to be buried in Mumbai?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?

Find out the missing number in the picture attached:

What is the last thing you take off before bed?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

By what process could you make a 'Tea-Table' into food?

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

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?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?