The volume (in cm³) gained by a person who gains 11.8 lb of fat is 5830.49 cm³
The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
1 lb = 453.592 g
Therefore,
11.8 lb = 11.8 × 453.592
11.8 lb = 5352.3856 g
Volume = mass / density
Volume = 5352.3856 / 0.918
Volume = 5830.49 cm³
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