People make me, save me, change me, raise me. What am I?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

How many times in a given day, minutes and hour clock comes in a straight line ?

What is the fastest way to double your money?

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

What Is It?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

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?