In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Can you place three balls such that the equation shown in the picture holds true?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

How many letters are in the alphabet?

What goes up but never comes down?

With the help clues provided in the image, can you find the 5 digit key?