Question

The length of a rectangle is twice its width.if its perimeter is 54 cm , find its length

Answer 1

Answer:

l=17

Step-by-step explanation:

2*(l+b)=54

given l=2b

b=l/2

2*(l+l/2)=54

2*(3l/2)=54

3l=54

l=17

Answer 2

Answer:

I think the answer is 18

Step-by-step explanation:

Perimeter of rectangle= 2(l+b), where l is the length and b is the width of the rectangle

Given,

perimeter = 54

l = 2b, therfore b = l/2

Substituting the value of Perimeter,

we get,

54 = 2(l+b)

Since b = l/2

54 = 2(l+l/2)

54 = 3l

l = 54/3

Therefore l = 18