Answer
The desk is 6 by 3.
Work Step by Step
Note, the 5 step process is as follows:
(1) Familiarize yourself with the problem.
(2) Translate the problem into Algebra.
(3) Solve.
(4) Check. Note, if we want to check a solution, we would plug it back into the equation and check that the equation yields a true statement.
(5) State the answer.
After becoming familiar with the problem, we find:
$$18=(w)(2w) \\ 9= w^2 \\ w=3\\ So: \\ l=(3)(2)=6$$
The desk is 6 by 3.
