The length of a cuboid is six times of its breadth, and the height of cuboid is four times of its breadth. If the breadth of the cuboid is 3cm, then what is the total surface area of the cuboid?

612 cm²

Given, length = 6 x breadth

height = 4 x breadth and breadth = 3 cm

Thus, length = 18 cm, height = 12 cm

Total surface area = 2(lb + bh +lh)

                           = 2(18x3 + 3x12 + 18x12)

                           = 2(54 + 36 + 216)

                           =   612 cm²