Final answer:
The flexible container will be 1/5 of the surface volume.
Step-by-step explanation:
To determine the volume of the flexible container at a height of 99' / 30m, we need to find the ratio of the surface volume to the total volume. The surface volume of a cube is given by 6r², where r is the length of the side of the cube. The total volume of the cube is given by r³. Setting up the ratio, we have 6r² / r³, which simplifies to 6 / r. Plugging in the height of the container, we have 6 / 30 = 1/5. Therefore, the flexible container will be 1/5 of the surface volume.