The length of the rectangle is 22m. What is the width if the perimeter is 54m?

For the convenience of the solution, we introduce the notation:

D = 22 m
P = 54 m
W =?

We know how to write a formula for a rectangle that can be used to calculate its perimeter. In our case:

P = 2 * (D + W)

Let us express the unknown W:

P: 2 = D + W
W = P: 2 – D = 54: 2 – 22 = 27 – 22 = 5 m

Check: P = 2 * (L + W) = 2 * (22 + 5) = 2 * 27 = 54 m

Answer: the width of the rectangle is 5 meters.