Write an equation to solve the following. Show all your work, including the steps for solving the equation and checking your answer. Clearly state your answer.
The perimeter of a rectangular photo is 72 cm. The length is twice the width.
What are the length and width of the photo?
(Hint: The formula for perimeter is 2w + 2l = P where w is the width, l is the length, and P is the perimeter.)
Answer: