The length, width and height of a cuboid container are 60cm, 40cm and 30cm respectively. The original height of the water surface is 25cm. After putting it into a cuboid container The length, width and height of a cuboid container are 60cm, 40cm and 30cm respectively. The original height of the water surface is 25cm. After putting in a cuboid iron block, all the iron blocks are submerged in the water, and the height of the water surface rises to 28cm. The length of the iron block is 20cm, the width is 15cm, and how many centimeters are behind the iron block?

The length, width and height of a cuboid container are 60cm, 40cm and 30cm respectively. The original height of the water surface is 25cm. After putting it into a cuboid container The length, width and height of a cuboid container are 60cm, 40cm and 30cm respectively. The original height of the water surface is 25cm. After putting in a cuboid iron block, all the iron blocks are submerged in the water, and the height of the water surface rises to 28cm. The length of the iron block is 20cm, the width is 15cm, and how many centimeters are behind the iron block?

Hello:
Volume of iron block:
60×40×（28-25）
=2400×3
=7200 (cm3)
Thickness of iron block:
7200÷（20×15）
=7200÷300
=24 (CM)

Pour 480 liters of water into a cuboid container 60 cm long and 40 cm wide. The water is 6.5 cm away from the mouth of the container. How high is the container?
Who will teach me

480 liter = 480 cubic decimeter = 480000 cubic centimeter
Water height = 480000 △ 60 △ 40 = 200cm
Vessel height = 200 + 6.5 = 206.5cm

I have another question: a cuboid container is 60 cm long, 40 cm wide and 30 cm high. It is filled with water. The area of the container is 800 cm
Square centimeter, 60 centimeter high cylindrical container. At that time, when the water in the cylindrical container was how many centimeters high, the water in the two containers was the same

Volume of water = 60 * 40 * 30 = 72000 cubic centimeters
The same time
Volume of water in two containers = 72000 / 2 = 36000 CC
Then the cylinder height = 36000 / 800 = 45cm
When the water in the cylindrical container is 45 cm high, the water in the two containers is the same

A rectangular playground is 450 meters long and 231 meters wide. Trees are planted at the four corners and all around. The distance between two adjacent trees is equal. How many trees should be planted at least?

The greatest common divisor of 450 and 231 is 3
450÷3=150
231÷3=77
At least (150 + 77) × 2 = 454 trees should be planted

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2. The relationship between the number of line segments and the number of points is -------

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