5/3. The same amount as for whites.
None. There are no light bulbs in the closet. Another one: Why is Justin Bieber so pale? Because there's no light inside the closet
Both should be changed regularly, and both for the same reason.
THAT'S NOT FUNNY!
Just two, but you're going to need a lot of patience and light bulbs.
Nothing. They're both mostly black, with a little bit of white at the top.
Whites occasionally get inside a colored wash.
Fifty Shades of Black
It's because their knee grows.