They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

When can we add 2 to 11 and get 1 as the correct answer?

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

By what process could you make a 'Tea-Table' into food?

If you paint a brown house white it will become a white house. If the stoplight changes from red to green, then the light is green. So, if you throw a white shirt into the Red Sea, what will it become?

What is both possible and impossible at the same time?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

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?