A cuboid container, 30 cm in length, 15 cm in width and 8 cm in height. Pour the water into a cuboid container with 20 cm in edge length, What's the depth of the water? There is 4cm deep water in the cuboid container

The volume of water is 30 * 15 * 4 = 1800cm
The bottom area of square container is 20 * 20 = 400cm2
Water depth 1800 / 400 = 4.5cm

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