Answer: The volume of the new tanks will be 27 times the volume of the original tanks.
Explanation:
Volume of a Cylinder: pi x radius^2 x height
H1 = 3h
R1 = 3r
new volume=pi x (3r)^2 x 3h
= 27x pi x r^2 x h
V1 = 27 units cubed
So the volume of the new tank will be 27 times the volume of the original tanks.