If the perimeter of a rectangular field is 120 feet and the length of one side is 25 feet, how wide

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If the perimeter of a rectangular field is 120 feet and the length of one side is 25 feet, how wide must the field be?

The perimeter of a rectangle P, is denoted as:
P = 2l + 2w

We're given l = 25, and P = 120, so we have
2(25) + 2w = 120

Simplify:
2w + 50 = 120

Typing this equation into our search engine, we get:
w = 35