Answer
$2w$
Work Step by Step
We are told that the length is twice of the width, $w$. Thus, we multiply the width by two to find:
$$l=2\times w$$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.