What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

I have an eye but still cannot see.

Who am I?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?