Step-by-step explanation:
Find the volume of the 2 cubes:
[tex]10 \times 15 \times 20 = 3000[/tex]
[tex]3 \times 3 \times 3 = 27[/tex]
Subtract the second cube (27) from the first cube (3000) as the second cube is taking up space (volume) in the first cube.
[tex]3000 - 27 = 2973[/tex]
The volume of the aquarium is 2973in^3
