Know how to calculate the surface area, width and height of a cuboid

Length is equal to the surface product divided by two, then subtract width by height, then divide width by height
The original surface area formula is (length multiplied by width, width multiplied by height, length multiplied by height) multiplied by two
So the formula for length can be written like this
Length width height area
a b c s
a=(s/2-b*c)/(b+c)

The width and height of a cuboid are equal, and both are equal to half of its length (as shown in the figure). Cut the cuboid into 12 small cuboids. The sum of the surface areas of these small cuboids is 600 square decimeters. Find the volume of the large cuboid

Let the left (right) surface area of the large cuboid be x square decimeters, then the front area of the large cuboid is 2x square decimeters; similarly, the area of the back, top and bottom is 2x square decimeters, and the newly added surface area is 2x × 3 + 2 × 2x × 2 = 14x square decimeters

A rectangular goldfish tank, measured from the inside, is four fifths of a meter long, one fourth of a meter wide and one half of a meter high. What is the volume of the tank? How many liters?

Know how to calculate the surface area, width and height of a cuboid