What is full of holes but still holds water?

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 ?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

I have no life, but I can die. What am I?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

Can you solve below mathematical equation?

2^1234 - 2^1233

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

In a town, there are over 100 flats.
Flat-1 is named first flat.
Flat-2 is named second flat.
Flat-3 is named third flat.

A visitors 'Victor' decides to walk through all the flats, he finds all the flats except flat-62.
Victor later founds that the local of the town have given it another name.

What is the name of the Flat?

Take away the whole and some still remain. What is it?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes