The best description of the chemical formulas C6H12O6 and C3H6O is:
same types of atoms, different numbers of each type.
Both compounds contain carbon (C), hydrogen (H), and oxygen (O), but they have different numbers of each type of atom. C6H12O6 has 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms, while C3H6O has 3 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom.