The perimeter is 168 ft  the length is 12 ft longer than 3 times the with . what is the dimensions

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perimeter = 2 x width + 2 x lengthlet length of width = xlength of length = 3x + 12 (12 ft longer than 3 times width)you are looking for 2 widths and 2 lengths (a rectangle), so the equation would be:x + x + 3x+12 + 3x+12 = 168now combine the x's and whole numbers to reduce down the equation.8x + 24 = 1688x = 168-248x = 1448x/8 = 144/8x = 144/8x = 18so widths are 18ft each and lengths are 3*(18)+12 or 66ft eachdimension is 18ft  x 66ft