Question

A rectangle has a length to breadth ratio of 7:5. The

Q: Answer-A rectangle has a length to breadth ratio of 7:5. The length is increased by 15% without any change...

Let length and breadth of the rectangle is 7x metres and 5x metres respectively. Area of rectangle 7x 5x 35x2 m2 When length is increased, area of the rectangle 1.15 7x 5x 40.25x2 m2 According to question 40.25x2 35x2 84 Or, 5.25x2 84 Or, x2 16 x 4 Perimeter of the rectangle 2 7 5 4 96 metres

length is increased by 15% without any change to the breadth, resulting in an 84 m² increase in the rectangle's area. What is the perimeter of the original rectangle?

A 96 metres

B 144 metres

C 120 metres

D 72 metres

E None of these