PSAT #1, Section 4, #25

You’re told that the length of the garden is 9 feet less than 3 times the width, so you need to translate that into math:

*l* = 3*w* – 9

Once you’ve done that, you can solve for the width and length because you know that the area (AKA: *lw*) is 5,670 square feet.

Because this is the calculator section, I wouldn’t waste much time trying to factor that. I’d just use my calculator (either graphing or a quadratic formula program) to see that the positive solution for *w* is 45 feet!

If *w* = 45 feet, then *l* = 3(45) – 9 = 126 feet. The perimeter of the garden, then, is 2(45) + 2(126) = 342 feet.