The length of the rectangle is 3 cm longer than the width. Its perimeter is 22 cm. Find the length, width of the rectangle.

Let the width of the rectangle be “x” cm, and the length of the rectangle (x + 3) cm. Since the perimeter of the rectangle is 22 cm, and the perimeter is found by the formula P = 2 * (a + b), we substitute the values into the formula and find the length and width of the rectangle 2 * (x + 3 + x) = 22; 2 * (2x + 3) = 22; 4x + 6 = 22; 4x = 22 – 6; 4x = 16; x = 16: 4; x = 4. So the width of the rectangle is 4 cm, then the length of the rectangle is 4 + 3 = 7 cm.
Answer: 7 cm and 4 cm.