Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

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?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Who can jump higher than a Mountain?

Move four matchsticks to the below square to form three squares?

When it's bad luck to meet a black cat?

What jumps when it walks and sits when it stands?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

In a kingdom, King George did not allow any citizen to visit the world outside. Also, only a person with proper paperwork was allowed to enter or he was sent back. A wooden bridge was what connected the kingdom to the world. The king had appointed a sharpshooter who would check the every five minutes on the bridge to check. After checking, he would go back to his hut and return exactly after five minutes again. The bridge took 9 minutes to cross.

A merchant was able to escape the kingdom without harming the shooter. How?