Five cubes, each of edge 3 cm, are joined end to end to forma cuboid. What is the total surface area of this cuboid?

225 cm² 243 cm² 216 cm² 198 cm²

198 cm²

Dimensions of the cuboid such formed = 15 × 3 × 3 T.S.A. = 2 (lb + bh + lh) = 2 (45 + 9 + 45) = 2 × 99 = 198 cm2