Xishan primary school is going to build a multi-functional classroom. It needs 1600 pieces of wood floor with a length of 50 cm, a width of 10 cm and a thickness of 3 cm to lay the floor. How large is the area of this multi-functional classroom? How many cubic meters of wood should be used to lay the floor? Pour 12 cubic decimeters of water into a 3-decimeter-long, 2-decimeter-wide and 4-decimeter-high rectangular glass tank. How many decimeters is the distance between the water surface and the tank mouth?

Xishan primary school is going to build a multi-functional classroom. It needs 1600 pieces of wood floor with a length of 50 cm, a width of 10 cm and a thickness of 3 cm to lay the floor. How large is the area of this multi-functional classroom? How many cubic meters of wood should be used to lay the floor? Pour 12 cubic decimeters of water into a 3-decimeter-long, 2-decimeter-wide and 4-decimeter-high rectangular glass tank. How many decimeters is the distance between the water surface and the tank mouth?

1. Area: 50 * 10 * 1600 = 800000 square centimeters
Volume: 50 * 10 * 1600 * 3 = 2400000 cubic centimeters = 2.4 cubic meters
2.3 * 2 = 6 12 / 6 = 2 4-2 = 2 decimeter
The answer is 2 decimeters