Given a soda can with a volume of 21 and a diameter of 6, what is the volume of a cone that fits perfectly inside the soda can? (hint: only enter numerals in the answer blank).

The volume of the cone that can best or perfectly fit into a cylindrical shaped object is 1/3 of the volume of the cylinder. 
                               volume of cone = 1/3 (volume of cylinder)
Substituting the known values,
                                volume of cone = 1/3 (21) = 7
Thus, the answer is 7

Your pictures are upside down