Final answer:
To determine the total number of fish in the tank, the volume of the tank (20 cubic feet) is multiplied by the density (0.2 fish/cubic foot), resulting in 4 fish.
Step-by-step explanation:
The question involves calculating the total number of fish in a tank given the volume of the tank and the density of fish per cubic foot. The volume of the fish tank is 20 cubic feet, and the density is 0.2 fish per cubic foot. To find the total number of fish, we multiply the volume of the tank by the density of the fish:
Number of fish = Volume of tank × Density of fish
Number of fish = 20 cubic feet × 0.2 fish/cubic foot
Number of fish = 4 fish
Therefore, the correct answer is B. 4.