What has to be broken before you can use it?

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 number comes next in the series?

5 15 5 18 5 24 14 20 _

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

The Judge knows that Alamgir was killed by his girlfriend Jasline, but the judge is unsure whether to punish her. Why?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

How many sides does a circle have?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.