Question

the length and breadth of a rectangular field are in the 7:4 ,if it's perimeter is 440. Find it's length and breadth.​

Answer 1

Answer:

Given : Perimeter = 440 m

Let the length of rectangular field = lx and breadth = 4x

2(l + b) = Perimeter

2(7x + 4x) = 440 m

2(11x) = 440 m

22x = 440 m

x = 440/22

x = 11 m

∴ Length = 7x = 7 x 11 = 77 m

Breadth = Ax = 4 x 11 = 44 m

Cost of fencing per m = ₹150

Cost of fencing 440 m = ₹150 x 440 = ₹66,000

Answer 2

Answer:

$let \: the \: length = 7x \\ breadth = 4x$

A/Q

$7x + 4x = 440 \\ 11x = 440 \\ x = \frac{440}{11} = 40$

$length = 7 \times 40 = 280 \\ breadth = 4 \times 40 = 160$