The expanded form of 54,625 is : 50,000+ 4,000+ 600+ 20 +5.
I found this online I hope it helps a little if not, then sorry.
Halmi had the most appropriate information because when you add both the girls and the boys up it is 56 after that you have to add 14+14=28.
28/56= exactly %50 of the entire group.