Aquarium curator 30 cm.

8 cm wide

The water in it is 7 cm high.

What is the average volume of each small bridge? A) Water level rise: 10-7=3 (cm) B) The total volume of the three small bridges is 30x8x3=720 (cm 3) C) The average volume of each small bridge is 720/3=240 (cm 3).

It's easy

It is the first drainage method to determine unknown points. ......

Drainage method (used to calculate the volume of an object): preparation tools: a cup, a measuring cup and water. Put the object to be measured into a cup filled with water, and measure the cup at the mouth of the cup in advance. When an object is put into a cup, water will overflow into the measuring cup, and the volume of water in the measuring cup is the volume of the object.