Volume of cubes = 64

side of cube = 4 cm

Two cubes are joined together end to end

So dimensiond of cuboid = 8 X 4 X 4

surface area of cuboid = 2(lb+bh+lh) =2(8 X 4 + 4 X 4 + 4 X 8)

                                                          = 2 X ( 32+ 16+ 32)= 2 X 80 =