What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

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 can you catch but never throw?

Why is the longest human nose just 11 inches?

Can you find the missing piece of the Porsche?

What is the next number in this series?

4,12,84,3612....

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

During which month do people sleep the least?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?