What number should finish this sequence?

23, 14, 19, 6, 20, ?

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: It's 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 ...

What is the next in this pattern:

104, 105, 106, 107, 108, 109, 110, 111, 112, 89, 47, 13, 18, 33, 85, 79, 4, 5, ?

While on your interplanetary vacation, you decide to stop at the planet Quocorri, a planet known for its many mathematical achievements.

While there, you decide to pick up on some of the Quocorrians mathematical variations. The Quocorrians won't tell you exactly how it works, only that it has some relationship to the Standard English math. They also give you four, true, Quocorrian math problems. They are:

2+2=9
4*1=1
5-2=16
...

Consider the following,

Mine = 456
His = 768
Hers = 523
Yours = 908

Now what phrase can you get from the rebus below?

4 7 5 8
5 6 2 0
6 8 3 9

What are the last three letters in this series?

S, L, S, A, P, A, L, B, L, H, M, R, T, M, M, M, M, L, S, ?, ?, ?