Question

The area of a rectangular hall is 5 times its perimeter.i f the breadth of the hall is 18 m,what is its length

Answer 1

By the question l×b = 5×2(l+b)
    given b=18
  then          l×18 =10(l+18)
                  18l =10l +180
                    8l =180
                    l=180÷8 =22.5 m ans.