Three cubes whose edges measure 3 cm, 4 cm, and 5 cm respectively are melted to form a new cube. Find the surface area of the new cube formed.

Given,

Edge of three cubes are respectively = 3cm , 4 cm , 5 cm

So,

Sum of volume of these cubes =

After melted these cubes a new cube is formed.

Let edge length of this new cube = a cm

So,

=

=

Edge of new cube = 6 cm

Surface area of new cube =

13