4 Doors Per Car
4 g in a cc is a ditloid, a type of word puzzle, each letter in the ditloid is the beginning of a word , you have the work it out, in this case the answer is Four Ghosts in a Christmas Carol.
100 Runs in a Century
12 picture cards in a deck
12 Picture cards in a deck
4 Cardinal Points of the Compass
4 corners on a tetrahedron.
2 covers on a book
2 Point Four Children
A possible answer could be '4 chambers in the human heart'.
2 Ugly Sisters/Stepsisters in Cinderella
4 Ghosts in a Christmas Carol (Charles Dickens)