In a $ccp$ arrangement,what is the number of octahedral voids per atom?

In a $ccp$ structure of a mixed oxide,$1/8$ of the tetrahedral voids are occupied by divalent $X^{+2}$ ions and $50\%$ of the octahedral voids are occupied by trivalent $Y^{+3}$ ions. The formula of the oxide is:

The number of tetrahedral voids per unit $HCP$ cell is

In a crystal lattice,the number of octahedral voids compared to tetrahedral voids is ...............

Calculate the total volume of a simple cubic unit cell in $\text{cm}^3$ if the void volume is $2.0 \times 10^{-23} \text{cm}^3$.

In a face-centred cubic $(FCC)$ lattice,where are the tetrahedral voids located?