Question

The length of a rectangular floor is 20 m, more than its breadth. If the perimeter of the floor is 280 m, what is its length?

Answer 1

let the breadth be x

length be x+20

perimeter = 2(L+B)

2(x+x+20) = 280

2x+20 = 140

2x = 120

x = 60

breadth = 60m

length = 80m

Answer 2

let
B=x
then,L=20+x
we know that

perimeter of rectangular =2(L+B)

therefore,
280=2(x+20+x)
=>140=2x+20
=>140-20=2x
=>120=2x
=>x=60
so, B=60m and L=60+20
=80m
I hope it help you.