If water volume is 0.2 m³ and void volume is 0.5 m³, degree of saturation is

Why is this the answer?

Degree of saturation S = (Vw / Vv) × 100%, where Vw is volume of water and Vv is volume of voids. S = (0.2 / 0.5) × 100 = 40.0%. S = 0% means dry soil; S = 100% means fully saturated (all voids filled with water).

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