1. A rectangular downpipe with a length of 4.5 meters and a square cross section with a side length of 2 meters. If this downspout needs painting, what is the area of painting? (Paint all sides, front, back, left and right)

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)