The volume of a cuboid is 27 cm3.Find its surface area.

I think your question should be , 
The volume of cube is 27 cm³ , find its surface area. It should be cube in place of cuboid.

Here is the answer.

$$\begin{gathered} \mathrm{Let} \mathrm{the} \mathrm{length} \mathrm{of} \mathrm{each} \mathrm{side} \mathrm{of} \mathrm{the} \mathrm{cube} = \mathrm{s} \\ \mathrm{Now}, \mathrm{volume} \mathrm{of} \mathrm{the} \mathrm{cube} = 27 {\mathrm{cm}}^3 \\ \Rightarrow {\mathrm{s}}^3 = 27 \\ \Rightarrow \mathrm{s} = \sqrt[3]{27} = \sqrt[3]{3 \times 3 \times 3} = 3 \mathrm{cm} \\ \mathrm{Surface} \mathrm{area} \mathrm{of} \mathrm{the} \mathrm{cube} = 6{\mathrm{s}}^2 = 6 \times {\left(3\right)}^2 = 6 \times 9 = 54 {\mathrm{cm}}^2 \end{gathered}$$