In making an alloy,a substance of specific gravity $s_1$ and mass $m_1$ is mixed with another substance of specific gravity $s_2$ and mass $m_2$. Then,the specific gravity of the alloy is:

  • A
    $\left( \frac{m_1 + m_2}{s_1 + s_2} \right)$
  • B
    $\left( \frac{s_1 s_2}{m_1 + m_2} \right)$
  • C
    $\left[ \frac{m_1 + m_2}{(m_1/s_1 + m_2/s_2)} \right]$
  • D
    $\left[ \frac{(m_1/s_1 + m_2/s_2)}{m_1 + m_2} \right]$

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