Fill a 20cm radius, HCM high cylindrical bucket with water and pour it into a cuboid water tank. If the water only accounts for half of the capacity, the capacity of the water tank is only half

Fill a 20cm radius, HCM high cylindrical bucket with water and pour it into a cuboid water tank. If the water only accounts for half of the capacity, the capacity of the water tank is only half

The volume of the cylindrical bucket is 20 * 20 * 3.14h, because the water tank is only half full
So the volume of water tank is 800 * 3.14h = 2512h cubic centimeter

Fill a cylindrical water bucket with 20cm inner diameter and HCM high with water and pour it into a cuboid water tank. If the water only accounts for 13% of the volume of the water tank, the volume of the water tank is___ cm3．

Let the volume of the tank be xcm3. From the meaning of the question, we can get: π× (202) 2 × H = 13X, and the solution is: x = 300 π h, so the answer is: 300 π H

A rectangular water tank, 30 cm long and 42 cm wide, is filled with water, and a small rectangular iron block, 21 cm long and 15 cm wide, is completely immersed in the water. When the iron block is removed, the water surface drops by 1 cm. What is the height of the iron block? (solution of equations)

A rectangular water tank, 30 cm long and 42 cm wide, is filled with water, and a small rectangular iron block, 21 cm long and 15 cm wide, is completely submerged in the water. When the iron block is removed, the water surface drops by 1 cm. How high is the iron block?
Let the height of the iron block be x cm
21×15x=30×42×1
315x=1260
x=4
A: the height of the iron block is 4cm