Perimeter of a Rectangular Garden

Sarah has a rectangular garden in her backyard. The length of the garden is 10 meters, and the width is 5 meters. She wants to build a fence around the garden. What is the perimeter of Sarah's garden?

To calculate the perimeter (P) of a rectangle, you can use the formula: $$ P = 2(l + w) $$, where $$ l $$ is the length and $$ w $$ is the width.