If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

What word does this rebus represent?

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How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

Eight of us go fourth, not back, to protect our king from an attack. What are we?

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?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

Considering the below equation:

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

Then, I + II + III = ?