Question

The volume of a fish tank is 20 cubic feet. If the density is 0.2fish over feet cubed, how many fish are in the tank? 2 4 50 100

Answer 1

For this case we have that by definition, the density is given by:

ρ
`=(M)/(V)`

Where:

M: It's the mass

V: It's the volume

We have as data that:

`V = 20 \ ft ^ 3`

ρ
`= 0.2 \frac {fish} {ft ^ 3}`

Clearing the Mass:

M = ρ * V

Substituting:

`M = 0.2 \frac {fish} {ft ^ 3} * 20 \ ft ^ 3\\M = 4 \ fish`

Answer:

Option B

Answer 2

`\huge\boxed{4}`

The tank has
`20ft^3` of water. There is an average of
`0.2` fish for every
`ft^3`.

So, we just need to multiply.
`20*0.2=\boxed{4}`

This means there are
`\boxed{4}` fish in the tank.