Question

what is the expenditure of paving a 5 metre broad road around a square ground of side 125 m at rupees 40 per metre square ​

Answer 1

Total expenditure to build the road = Rs. 51000

Side of the square ground = 125 m = a

Area of the square ground = a² = 15625 m²

Width of the road = 5m

Now , side of the ground including the road = (a+5) = 130 m

Area of ground including the road = (a+5)² = (130)² = 16900 m²

Area of the road = Area of ground including the road - area of the ground

=> 16900 - 15625

=> 1275 m²

Total expenditure to build a 5m road around the ground = 40 × 1275

= Rs. 51000