What is the word or phrase?

You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It's behind B or C
Door B: Its behind A or D
Door C: It's in here
Door D: It's not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Solve the mathematical equation in the picture below.

What number when divided in half becomes zero?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

Where do fish keep their money?

Can you decipher the below rebus?

PBLUESAISNUERSES