Question

the length and the breath of a rectangular field are in the ratio 5:4 and its area is 3380m^2.find the cost of fencing it at the rate of rd 75 per m

Answer 1

let the ratio be 'x'
area of rectangle = lxb

Answer 2

The length and the breath of a rectangular field are in the ratio 5:4
length=5x
breadth=4x

area is 3380m^2
are of rectangle =lenght *breadth
3380=5x*4x
3380=20x²
x²=3380/20
x²=169
x=√169
x=13cm
length=5x
          =13*5=65 cm
breadth is 4x
so 13*4=52cm

perimeter of rectangle=2(l+b)
                                    =2(65+52)
                                      =234cm
cost of fencing it at the rate of rd 75 per m
=75*234
=17550 ruppes (per m²)
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