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1. The volume of the tank is 25ft³.

   Suppose, the volume of the fish tank is v ft³.

   According to the given question.

   The density(d) of the fish tank is 0.4 fish/ ft³.

   And the total number of fish in the tank is, n =  12.

   As, we know that the population density (d) of the fish in the tank is the number of fishes (n) in a given volume (v)

   So, the volume of of the tank is given by

   d = n/v

   ⇒ 0.5 = 12/v

   ⇒ v = 12/0.5

   ⇒ v = 25ft³.

   Hence, the volume of the tank is 25ft³.

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