Question

the length and breadth of a rectangular field are in the ratio of 2 ratio 5 if the area of the field is 5290 m square find the cost of fencing it at rupees 40 per metre​

Answer 1

let ratio be equal to x

Then length = 2x

and breadth = 5x

2x × 5x = 5290 m sq.

10 x^2 = 5290

x^2 = 529

x = 23 metres

length = 2×23=46 metres

breadth = 5 ×23 = 115 metres

perimeter = 2(l+b)

=2(46+115)

=322 metres

cost of fencing = 322×40

Rs.12,880