Two cubes, each having a total surface area of 150 cm², are joined together to form a cuboid. Find the total surface area of the resulting cuboid.

250 cm²

We know that,

Total Surface Area of cube = 6 × side²

Total Surface Area of cuboid = 2 × (lb + bh + hl)

We have,

Surface area of each cube = 150 cm²

Total Surface Area of cube = 6 × side² = 150

side = 5 cm

Length = l = 5 + 5 = 10

Breadth = b = 5 cm

Height = h = 5 cm

Total Surface Area of cuboid = 2 × (10 × 5 + 5 × 5 + 5 × 10)  = 250 cm²