Answer:
Alvin can't have more than 2 fishes on his tank.
Step-by-step explanation:
In order to calculate how many fish Alvin can have in his tank we first need to calculate the volume of the tank. A prism's volume is given by the following formula:
v = Abase*h
Therefore for Alvin's, we have:
v = 0.9*0.6 = 0.54 m³
Since he can't have more than 5 fish per cubic meter we can use a rule of three in a way that:
5 fish -> 1 m³
x fish -> 0.54 m³
5/x = 1/0.54
x = 0.54*5 = 2.7
Since he can't have a 0.7 fish and in order to mantain the density to the recommended level, he can't have more than 2 fishes.