Finding width with unknown variable

[Guest]

The length of a rectangular label is 3 centimeters less than twice the width. The perimeter is 54 centimeters. Find the Width. Define your work with the unknown quantities in terms of variable.
Please help. I don't even know where to begin.

[shyamjayakannan]

Let the width be [tex]w[/tex] and the length be [tex]l[/tex]. Now, perimeter = [tex]2(l+w)=54[/tex] and we are also given that [tex]l=2w-3[/tex]. Solve the two equations to get [tex]\boxed{w=12}[/tex].