Kenneth S. answered 04/09/17
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
Assuming you're discussing a rectangle, let its dimensions be w (width) and 3w+5. Add up the two widths and two lengths and set them equal to 530. Solve the equation for w. Then calculate the length, from above expression.
Those are the dimensions, in feet.