I travel all around the world but always stay in the corner. What am I?

Can it be possible to build a house that has all its four walls facing towards the South?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

A devotee visits 9 temples when he visits India. All these nine temples have one thing in common - there are 100 steps in every temple. The devotee puts the Re.1 coin after climbing up every step. He does the same while climbing down every step. At each temple, the devotee offers half of his money from his pocket to god. In this way, his pocket becomes empty after he visits the 9th temple.

Can you calculate the total amount he had initially?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

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?

How can you write nineteen in a manner that if we take out one, it becomes twenty?