A cube of external dimension $10\  cm$ has an inner cubical portion of side $5\  cm$ whose density is twice that of the outer portion. If this cube is just floating in a liquid of density $2\  g/cm^3$, find the density of the inner portion
  • A$\frac{8}{9}\ gm/cc$
  • B$\frac{16}{9}\ gm/cc$
  • C$\frac{32}{9}\ gm/cc$
  • D$\frac{5}{4}\ gm/cc$
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