To investigate how cell size affects the rate of diffusion, a biology student modelled spherical and cuboidal cell structures. They recorded the dimensions, surface area, volume, and surface area to volume (SA:V) ratio for three different sizes of cuboidal model cells in Table 1.
Table 1
| Model cell | Side length (μm\mu\text{m}μm) | Surface area (μm2\mu\text{m}^2μm2) | Volume (μm3\mu\text{m}^3μm3) | SA:V ratio |
|---|---|---|---|---|
| Cell A | 10 | 600 | 1,000 | X |
| Cell B | 20 | 2,400 | 8,000 | 0.3 : 1 |
| Cell C | 50 | 15,000 | 125,000 | 0.12 : 1 |
Calculate the SA:V ratio (X) for Cell A shown in Table 1.
