The perimeter of the rectangle is 54 cm, and its width is 3 cm less than its length. find the sides of the rectangle.

Solution: Knowing that the rectangle consists of four sides (two lengths and two widths), we will form an equation with one unknown. This unknown will be “x”, through which we denote the value of the width of the rectangle. Then, the value of the length will be equal to X + 3. After determining the length and width of the rectangle, we can make the equation: 2 (X + X + 3) = 54. Solving this equation, we get 2X + 3 = 27 or 2X = 24. Hence, X is 12 cm (the width of the rectangle), and the length of the rectangle is 15 cm (3 cm more than the width). Answer: width 12 cm, length 15 cm.