Can you write down eight eights so that they add up to one thousand?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

John is the son of Jacob.
So,
Jacob is the_____of John's father?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Replace the question mark with the correct number in below Picture:

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

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?

Which letter of the alphabet has the most water?