Was thinking Connecticut when I read this, but then gave up on that. Not gonna give it to you, but think about Canada
12 Picture cards in a deck
12 picture cards in a deck
4 Cardinal Points of the Compass
This may no longer apply but the Ditloid answer is 12 Provinces of Canada. NOTE There used to be 10 provinces and 2 territories - now increased to 3.
12 court cards in a pack of playing cards
If we're talking strictly algebra. 12 equals p of c can be written as: 12= p(c) meaning, 12 is the answer for some function p, when c is the variable.
Peugeot 205
13 Hearts in a Pack of Cards.
2 Point Four Children
11 pipers piping [ 12 Days of Christmas lyrics ]
240 Pence in a pre decimal pound
4 Doors Per Car