Volume is Length x Width x height.
The pool is cubical, so the length and width are the same dimension.
First find the volume of the pool that is filled by water:
Volume = 12 x 12 x 2 = 288 cubic meters.
Now convert cubic meters to liters:
1 cubic meter = 1,000 liters
288 x 1000 = 288,000 liters
To help in the future, you can follow the equation
Whole * Percent = whole
In this case, the whole is 48 and the percent is 5/8
48 / 5/8 = 30
A quotient can only be figured out by division. Hope this helps!