To find out how many fish are in the fish tank, we need to use the formula:
Number of fish = Volume of tank (cubic feet) × Density (fish per cubic foot)
In this case, the volume of the tank is 40 cubic feet, and the density is 0.4 fish per cubic foot. Plugging these values into the formula gives us:
Number of fish = 40 cubic feet × 0.4 fish/cubic foot
Now, performing the multiplication:
Number of fish = 16 fish
So, the tank can hold a total of 16 fish.