A certain rectangle has perimeter of 54, If the ratio of the length of the rectangle to the width is 5 to 4, what is the length of the rectangle?

Given that $1+w=54,1 / w=5 / 4$ $\begin{array}{l} \Rightarrow 41=5 w \Rightarrow w 1+\frac{4 l}{5}=54 \\ \Rightarrow \frac{9 l}{5}=54 \Rightarrow \frac{54 \times 5}{9} \Rightarrow 1=30 \end{array}$