Which number should replace the question mark?

What number when divided in half becomes zero?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

What is common among 11, 69, and 88?

What has lots of eyes, but can’t see?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?