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

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

What occurs twice in a week, once in a year but never in a day?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Using exactly three matchsticks, can you divide the area into two equal parts?

If an electric train is travelling south, then which way is the smoke going?

John and his team plan to rob a safe. They got just one chance to break the code else the local police will be informed. Below are clues:
A) Exactly one number is perfectly placed: 9 8 1
B) Everything is incorrect: 9 2 4
C) Two numbers are part of the code of the safe but are wrongly placed: 0 9 3
D) One number is part of the code of the safe but is wrongly placed: 1 4 7
E) One number is part of the code of the safe but is wrongly placed: 7 8 3

What number when divided in half becomes zero?

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?