Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

I’m tall when I’m young, and I’m short when I’m old. What am I?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

What do you get if you add 2 to 100 four times?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

How can you take 2 from 5 and leave 4?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

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

Who am I?