Assistance required

Okay, I can help with some riddles, but need help with others. I know how to get some info about OWLS (Greeny from Madam Pince(WC site)

Bakers Dozen = 13 x
days of Christmas=12 x
Red balls on Snooker table=15 +
Battle of Hastings= 1066 -
number of keys on a piano= 88

(13x12x15) +1066 - 88

Site owner has a tri-colored cat (no white)- what breed is this?

For the Older brother/ younger brother one, think of WIZARD COIN types


I can also help with Gringott's gate

I also need to find the rest of the owls.

Now General interactive help I need,
Snape asks:
How odd, some weird 'monkey' thing just ran past me blabbering some random numbers:
"28 92 4 6 101" - do you have a clue what this means?

On the home page, when I click on the note at the lower left, what notes do I need to play for the secret? or how do I find out which notes to play?

What do I need to do to find the question abotu perfect numbers?

What does Magr Marmalade ont he cow head in Vault 16 mean?

What other vaults can one enter, and how do I find the clues? I've been in vaults #1 and 11, using 4291, but all they do is bring me to w window witht the home page.