What has to be broken before you can use it?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

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

What runs around the whole yard without moving?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

On 26-01-2022, Juli was murdered at her house in a city in India in the afternoon. There were three suspects in the murder and the following are the statements that were given by them:

John: I visited my village that day.
Jacob: I was out to deposit my house tax in the municipality office at that time.
Jonny: I was at a friend's place having lunch at that time.

Can you find out who is the murderer?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?