We will haev the following:
[tex]\begin{gathered} \rho=\frac{350g}{62cm^3}\Rightarrow\rho=\frac{175}{31}g/cm^3 \\ \\ \Rightarrow\rho\approx5.6g/cm^3 \end{gathered}[/tex]So, the density of the material is 175/31 g/cm^; that is approximately 5.6 g/cm^3.
