Length of a rectangle is three times its breadth. Perimeter of the rectangle is 40cm. Find its length and width.


Given:


Length, l = 3 × Breadth, b


Perimeter of rectangle = 2 × (l + b)


2 × (3b + b) = 40


2 × 4b= 40


8b = 40


b = 5 cm


Length, l = 3 × 5


Length = 15 cm


Breadth = 5 cm


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