The length of the parallelepiped is 18 cm, the width is 2 times less than the length, and the height is 11 cm more than the width.

The length of the parallelepiped is 18 cm.

The width of the parallelepiped is 2 times less than the length.

The height of the parallelepiped is 11 cm more than the width.

Let’s define the volume of this parallelepiped. We write down the solution.

First you need to determine the width of the box.

18: 2 = 9 cm.

Therefore, the width is 9 centimeters.

Next, you need to determine the height.

9 + 11 = 20 cm.

Therefore, the height is 20 centimeters.

Next, we define the volume of the parallelepiped.

V = a * b * c.

V = 18 * 9 * 20 = 3240 cm ^ 3.

Answer: the volume of a parallelepiped is 3240 cm ^ 3.