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Two bodies are in equilibrium when suspended in water from the arms of a balance. The mass of one body is 36 g and its density is 9 g / cm3. If the mass of the other is 48 g, its density in g / cm3 is
(a)$\frac{4}{3}$                                         (b) $\frac{3}{2}$
(c) 3                                           (d) 5