The perimeter of a rectangle is 24 cm. One side of this rectangle is twice as long as the other. Find the length of each side.

Let one side of the rectangle be x cm, then the second side, according to the condition of the problem, is equal to 2x cm.The perimeter of the rectangle is P = 2 (a + b) = 2 (x + 2x), which, according to the condition of the problem, is 24 cm.Let us compose and solve the equation:
2 (x + 2x) = 24;

x + 2x = 12;

3x = 12;

x = 4 (cm) one side of the rectangle. Then the second side of the rectangle is 2x = 2 * 4 = 8 cm.

Answer: One side of the rectangle is 4 cm and the other side of the rectangle is 8 cm.