The ratio of length and breadth of a cuboidal tank is 2 : 1 and its height is 5m. The area of 4 walls is 210m², then its volume is:-

490 m³

Length : Breadth = 2 : 1

Area of 4 walls = 2 h (l + b)

⇒ 210 = 2 × 5 (2R + 1R)

⇒ R = 7

Dimensions = (2 × 7), (1 × 7), 5

                   = 14 m, 7 m, 5 m

Volume of cuboid = lbh = 14 × 7 × 5 = 490 m³