The external length, width and height of an own rectangular container are 41 cm, 21 cm and 15.5 cm respectively. The thickness of the materials making the container is 5 mm. If the container has 8 litres of water, calculate the internal height above the above the water level.

2 answers

internal base area ... 40 cm * 20 cm

8 L = 8000 cm^3

divide water volume by base area to find water height
It's quite hard