Correct Answer: Option A

Explanation

\(V_A = \frac{M}{D} = \frac{21}{0.7} = 30cm^3\)

\(V_w = \frac{M}{D} = \frac{10}{1} = 10cm^3\)

V_mixture = 30 + 10 = 40cm³

M_mixture = 21 + 10 = 31g

D_mixture = \(\frac{m}{v} = \frac{31}{40} = 0.775\)

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