Can you place three balls such that the equation shown in the picture holds true?

Christina is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named John, who is older than Christina, who's the youngest?

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?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

What is the coolest letter in the alphabet?

What is the riddle which can be asked all day with a different correct answer each time.

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

10+10 and 11+11 can give you the same answer.

Explain how?

What have one eye but still cannot see?