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A cuboid glass fish tank is 5 decimeters in length, 4 decimeters in width and 3 meters in height. (1) how many square meters of glass do you need to make the fish tank? (2) how many square meters of glass do you need to make the fish tank A cuboid glass fish tank is 5 decimeters long, 4 decimeters wide and 3 meters high. (1) how many square meters of glass does it need to make the fish tank? (2) put some pebbles into the water, and the water surface rises by 2.5 cm. What is the volume of these pebbles?
（1）
Need glass
=5×4+2×（5×3.5+4×3.5）
=83 square decimeters
=83 square meters
（2）
Cobble volume
=（5×10×4×10）×2.5
=5000 CC
A 28cm high and 4200cm cubic rockery is placed in the waterless fish tank. The water pipe injects water into the tank at a flow rate of 8dm cubic meter per minute. How long does it take to submerge the rockery
Sorry! I didn't write it clearly! The length of the fish tank is 46cm, the width is 25cm, and the height is 28cm!
32200CM3
In a fish tank without water, put a 28 cm high and 5200 cubic cm rockery. If the water pipe flows at 8 cubic decimeters per minute
How long does it take to fill the tank with water to completely submerge the rockery?
The tank is 46 cm long, 25 cm wide and 28 cm deep
What is the size of the cylinder?
8 cubic decimeters per minute = 8000 cubic centimeters per minute
The volume of 28 cm water is 46 * 25 * 28 = 32200 cubic cm
The volume of stone is reduced by 32200-5200 = 27000
It takes 27000 / 8000 minutes to fill so many volumes
Just know the length and width of the jar, because the height is determined by the height of the stone
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