Question

the sides of a rectangular park are in the ratio 4:3 ,if the area is 1728m square. Find the cost of fencing at the rate of Rs. 2.50/ mt ? please help

Answer 1

Area of rect.=l×b

so,4x ×3x =1728

12x square =1728

x square = 1728/12×2.5

x square = 144×2.5

x =√144 × 2.5

12 × 2.5

30 rs

Answer 2

let the length is 4x and 3x

ATQ

$4x \times 3x = 1728 \\ 12 {x}^{2} = 1728 \\ {x}^{2} = 144 \\ x = 12$

length 4x=4×12=48

breadth 3x=3×12=36

perimeter 2(l+b)

2(36+48)

2×84=168

cost of fencing =168/2.5

67.2 rs