The length of rectangle is thrice its breadth and its perimeter is 48cm. Find length and breadth of rectangle.

Let the breadth of rectangle = b

length of rectangle = 3b

Perimeter of rectangle = 2 × (3b + b)

48 = 2 × (3b + b)

48/2=4b

24 = 4b

24/4=b

⇒ 6 = b ⇒ breadth = 6cm

length = 3b = 3 × b = 18cm