Question

The surface area of a cube is 54 sq inches. A new cube has double the edge lengths of the first cube. What is the surface area of new cube?

Answer 1

216 sq inches

Explanation:

Let initial surface area be given by l*w hence lw=54 square inches

When the new cube has double edge lengths, new l is 2l and new w is 2w

New area is 2l*2w=4lw

If lw=54 square inches

4lw=?

New area=4lw*54/lw=216 square inches

Therefore, the new surface area will be 216 square inches