Answer:
27
Explanation:
When looking for the volume of a prism you multiply the base and height to get the volume. When looking for the volume of a pyramid of the same base and height all you need to do is multiply .333 or 1/3 in decimal form to get the correct answer.
The volume of the prism: (3)(3)(9) = 81
The volume of the pyramid: (1/3 or .333)(3)(3)(9) = 26.973 = 27