4.5 meters = 45 decimeters
2× 4× 45 = 360 (square decimeter)
2. There is a cuboid container with a length of 30cm, a width of 20cm and a height of 10cm. The water depth inside is 6 cm. How many centimeters should this container be if it is tightly covered and then erected to the left?
The volume of water is
30× 20× 6 = 3600 (cubic centimeter)
Stand to the left, the water depth inside should be
3600 ÷ (20× 10) = 18 (cm)