Answer:
5.7 litres
Step-by-step explanation:
The salt is not a liquid so you do not need to add it in.
4.5 litres + 1.2 litres = 5.7 litres
x ^ 2 = 144
x = 12, x = -12
Check:
12 * 12 = 144
-12 * -12 = 144