Find the area of the rectangle if you know that 1/5 of the rectangle is 30cm.

It is clear from the conditions of the problem that the rectangle was mentally divided into five equal parts. Since the perimeter is measured in centimeters, it becomes clear that 1/5 or 30 cm is conventionally 1/5 of the entire perimeter. If the entire perimeter is equal to one or 5/5, then, in order to find the entire perimeter, you need to multiply 30 by 5 such parts.

Let’s write down the solution:

30 * 5 = 150 cm.

Answer: 150 cm is the perimeter of the entire rectangle.