Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

You are a prisoner sentenced to death. The Emperor offers you a chance to live by playing a simple game. He gives you 50 black marbles, 50 white marbles, and 2 empty bowls. He then says, 'Divide these 100 marbles into these 2 bowls. You can divide them any way you like as long as you use all the marbles. Then I will blindfold you and mix the bowls around. You then can choose one bowl and remove ONE marble. If the marble is WHITE you will live, but if the marble is BLACK... you will die.'

How do you divide the marbles up so that you have the greatest probability of choosing a WHITE marble?

How far can you walk into the woods?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

What is the word or phrase?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

A father's child, a mother's child, yet no one's son.

Who am I?

The Little ant seems to be always confused. Do you know why?