Let the weights of the body in the air, water and liquid be "m_1 = 0.5 kg, m_2 = 0.3 kg, m_3 = 0.2 kg" respectively.
The net force acting on the body in liquid/gas is "mg - \\rho g V_{body}", where "\\rho" is the density of the liquid/gas.
Hence, the weights, expressed in terms of gravitational force and buoyant force are "m_2 = m_1 - \\rho_w V_{body}", "m_3 = m_1 - \\rho_{liq} V_{body}".
Dividing last two equations, obtain "\\frac{\\rho_{liq}}{\\rho_{w}} = \\frac{m_1 - m_2}{m_1 - m_3} = \\frac{0.3 kg}{0.2 kg}" , from where "\\rho_{liq} = 1.5 \\rho_{w}", so the liquid is 1.5 times denser than water.
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