Question

The length and bredth of a rectangur field is in the ratio of5:3 the area of th field is 2160sq m if a fence is to be made at the rate of 350per metre how much it will cost

Answer 1

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5x*3x =2160

15 x^2= 2610

x^2 =2160/15 =144

x=√144. =12

l= 5*12 =60

b=3*12 =36

p= 2(60+36) =2*96 =192

cost = 192 * 350. =67200

ans is rs 67200

Answer 2

Let the length of the rectangular field be 5x and breadth be 3x.

We know that area of rectangle = length × breadth

So, 5x × 3x = length of rectangular field = 2160sq m.

15xsq = 2160

Xsq = 2160/15 = 144

X = √144 = 12

So, length = 5 × 12 = 60 m and

Breadth = 3 × 12 = 36 m.

Now, we know that perimeter of rectangle = 2(length±breadth)

2(60±3-) = 2 × 96 = 192 mts.

So, cost of fencing will be 192 × 350 = ₹67200.