Number of fishes in the tank are 9.
Given
Density (d)= 0.3 fish/ft³
Volume of a fish tank (V) = 30 ft³
number of units(n)= ?
Density, mass of a unit volume of a material substance. The formula for density is d = n/V, where d is density, n is quantity(number of units), and V is volume. Density is commonly expressed in units of grams per cubic centimetre.
d = n/V
d = n/V
n = d * V
n = 0.3 fish/ft³ * 30 ft³
number of units(n) = 9
Hence,
Number of fishes in the tank are 9.
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