Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

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

Can you name an animal whose killing cannot be performed without spilling your own blood?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

In the four images below, can you find the odd one out?

What number divided by 4 is the same as that number minus 4?

Can you find out which options fits best with the missing column?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

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?