Can you replace the question mark with the correct number in the below table sequence?

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

You bought me for dinner but never eat me. What am I?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Give it food and it will live; give it water and it will die.

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

I cannot talk, but I always reply when spoken to. What am I?

I always drive my customer away.

Who am I?

This was asked in an interview with Coa-Cola.

The interviewer has given me 100 marbles(50 white and 50 black) and two empty boxes.
He then told me that he will leave the room and i need to place all the marbles in two boxes.

And When he come back, he will draw a marble from any of the two box and if the marble is white I will be hired.

Also
* No box can be empty.
* All 100 marbles must be placed in one of the two boxes.

So what should I have done?

What have one eye but still cannot see?