3 208 to 214 b in the h b = 208 to 214 bones in the human body
5 6 s of a c = 6 sides of a cube
6 8 b in a b = 8 bits in a byte
10 191 u n m s = 191 United Nation Member States
15 9 p in the s s = 9 Planets in the Solar System
21 21 q s f = 21 Questions so far.
I'll have to think more on the rest of them.