Question

the cost of fencing of rectangular field at rupees 24 per metre is 1920 if its length equal = 23 M find its breadth

Answer 1

perimeter = fencing / cost
= 1920/24
= 80
perimeter = 80m
perimeter = 2 (L+B)
80 = 2(23 +x )
80/2 = 23+x
40 = 23+ x
x = 40 - 23 = 17
breadth = 17 m

Answer 2

cost of fencing of rectangular field per meter is 24 rupees
total no of meters 1920/24 =80
perimeter=2(l+b)=80
l+b=40
23+b=40
b=17