Question

A rectangular lawn 70 m by 60 M has to road is 4m wide running through the middle of the lawn 1 parallel to the length and other parallel to the breadth find the cost of Grey bring the roads at rupees 5.50 permit scale

Answer 1

ar(rectangle)=l*b
                    =70*60
                    =4200
ar(2 roads)=ar(1road+another road -central square junction)
                  =70*4+60*4-4*4
                  =280+240-16
                  =504
ar(gravelling)=ar(rectangle-roads)
                    =4200-504
                    =3696
3696*5.50=cost
              =20328