Question

the length of a rectangular floor is 20m, more than its breadth.if the perimeter of the floor is 280m, what is it's length​

Answer 1

Answer:

length = 80m

Step-by-step explanation:

Let breadth be b and length be l

l = 20 + b

Perimeter of rectangle = 2(l+b)

280 = 2(20 + b + b)

20 + 2b = 140

2b = 120

b = 60

l = 20 + 60

 = 80m

∴ Length of floor is 80m

Answer 2

Answer:

60m

Step-by-step explanation:

Let the breadth of rectangle be x

So, the lenth will be x+20

Perimeter of rectangle = 2(l+b)

2(x+20+x) = 280

2(2x+20) = 280

4x+40 = 280

4x = 280-40

4x = 240

x = 240/4

x = 60

therefore, the lenth of the rectangle is 60m