Forward I am heavy, but backward I am not. What am I?

A ton.

He has married many women, but has never been married. Who is he?

A priest.

How are a jeweler and a jailer alike? The jeweler sells watches and the jailer .

watches cells.

How many bricks does it take to complete a building made of brick?

Only one - the "last" one.

How many of each animal did Moses take on the ark?

Hint: Who?

How many times can you subtract the number 5 from 25?

Once. After the first calculation, you will be subtracting 5 from 20, then 5 from 15, and so on.

How much dirt is in a hole 4 feet deep and 2 feet wide?

There is no dirt in a hole.

I am used to bat with, yet I never get a hit. I am near a ball, yet it is never thrown. What am I?