Determine the volume of the tank that needs to be filled in. The current water level is of the height 13.

The volume of the tank is the amount of water that can fill it.
The volume of the tank that needs to be filled in is [tex]66\frac {2}3[/tex]
The height of the tank is:
[tex]H =3[/tex]
The height of the water in the tank is:
[tex]h =\frac 13[/tex]
So, the height (x) of the empty space is calculated as:
[tex]x = 3 -\frac 13[/tex]
Evaluate the difference
[tex]x = \frac 83[/tex]
The volume of water to fill in, is then calculated as:
[tex]V = L * W * x[/tex]
This gives
[tex]V = 5 * 1\frac 23 * \frac 83[/tex]
Rewrite as:
[tex]V = 5 * \frac 53 * \frac 83[/tex]
Evaluate the product
[tex]V = \frac {200}3[/tex]
Rewrite as:
[tex]V =66\frac {2}3[/tex]
Hence, the volume of the tank that needs to be filled in is [tex]66\frac {2}3[/tex]
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