2。 A cuboid is cut into two completely equal cubes. The sum of the side lengths of the two cubes is 40 centimeters more than the original cuboid. What is the length of the original cuboid?
3. A rectangular goldfish bowl with no cover, 8 cm long, 6 cm wide and 7 cm high. How many square decimetres does it take to make this fish tank? How many liters of water can this fish tank hold? (Ignoring glass thickness)
There is a cuboid with a low surface of 300 square centimeters and a height of 10 centimeters, which contains water with a depth of 5 centimeters. At present, a stone is immersed in water, and the water level rises by 2 cm. What is the volume of this stone in cubic centimeters?