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

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

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

The more of this there is, the less you see. What is it?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Who is that with a neck and no head, two arms and no hands? What is it?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

I taste better than I can smell. Who am I?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

Considering the below equation:

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

Then, I + II + III = ?