The volume of the cube is 27 cm3, which is equal to the length of its edge.

In order to solve this problem and get the right answer, you need to know some geometric formulas and be able to transform them to fit the problem.
Let’s write down a short condition, after carefully studying the text of the problem:
The volume of the cube is 27 centimeters3;
Rib length -?;
To find the length of the edge of a cube, you need to remember the formula for the volume of a cube:
V = a ^ 3 (the volume of a cube is equal to the length of its edge, raised to the third power);
Since we know the volume of the cube, we find the length of its edge;
a ^ 3 = 27;
a = 3 centimeters – the edge of the cube;
Answer: 3 centimeters.