Question

The perimeter of a rectangular garden 420 m and its length is 120 m.What is its breadth?

Answer 1

here is your answer

perimeter=2(l+b)

420=2(120+b)

420/2=120+b

210=120+b

210-120=b

90=b

so breadth of garden=90cm

hope this will help you

Answer 2

perimeter=2(l+b)
perimeter=2(120+b)
420=240+2b
180=2b
90=b
breadth=90m