The perimeter of the rectangle is 72cm. What is the length and width of a rectangle if the width is 3 times less than its length?

Decision:
The perimeter of a rectangle is equal to the sum of all its sides.
x cm – the width of the rectangle
3x cm – rectangle length
Let’s make the equation:
(x + 3x) * 2 = 72
4x * 2 = 72
4x = 72/2
4x = 36
x = 36/9
x = 4
4 cm – rectangle width
3 * 4 = 12
12 cm – rectangle length
Answer: width – 4 cm, length – 12 cm