Let the width of floor be x m ⇒ Length of the floor = x × 125/100 = 1.25x As we know, Area of the floor = length × width According to the question x × 1.25x = 20 ⇒ x2 = 20/1.25 ⇒ x2 = 16 ⇒ x = √16 ⇒ x = 4 ∴ Sum of length and width of the floor = x + 1.25x = 2.25x = 2.25 × 4 = 9 m