c
વિશિષ્ટ ઘનતા \( = \frac{{{\rm{Mass of alloy }}}}{{{\rm{Volume of alloy}} \times {\rm{density of water }}}}\)
\( = \frac{{{m_1} + {m_2}}}{{\left( {\frac{{{m_1}}}{{{\rho _1}}} + \frac{{{m_2}}}{{{\rho _2}}}} \right) \times {\rho _w}}}\)\( = \frac{{{m_1} + {m_2}}}{{\frac{{{m_1}}}{{{\rho _1}/{\rho _w}}} + \frac{{{m_2}}}{{{\rho _2}/{\rho _w}}}}} = \frac{{{m_1} + {m_2}}}{{\frac{{{m_1}}}{{{s_1}}} + \frac{{{m_2}}}{{{s_2}}}}}\) \(\left[ {{\rm{As\, specific \,gravity \,of\,substance }} = \frac{{{\rm{density \,of\, substance }}}}{{{\rm{density\, of \,water}}}}} \right]\)