Question

the length and breadth of a rectangle are at in the ratio 5:4 and its area is 3380m2 find the cost of fencing it at the rate of 75 eps per metre

Answer 1

Correct Question:

The length and the breadth of a rectangular field are in the ratio 5 : 4 and its area is 3380 m2. Find the cost of fencing it at the rate of ₹75 per m.

Answer:

₹ 17550

Step-by-step explanation:

Ratio in length and breadth = 5 : 4

Area of rectangular field = 3380 m2

Let length = 5x and breadth = 4x

5x x 4x = 3380

=> 20x2 = 3380

x2 = 3380/20 = 169 = (13)2

x = 13

Length = 13 x 5 = 65 m

Breadth =13 x 4 = 52 m

Perimeter = (l + b) = 2 x (65 + 52) m = 2 x 117 = 234 m

Rate of fencing = ₹ 75 per m

Total cost = 234 x 75 = ₹ 17550