The length of the rectangle is 1m 25 cm, and the width is 5 times less.

The length of the rectangle is 1m 25 cm, and the width is 5 times less. Find the side of a square whose perimeter is equal to the perimeter of this rectangle.

The solution of the problem:
1.1 m 25 cm = 125 cm.
2. The width of the rectangle is 125/5 = 25 cm.
3. Define the perimeter of the rectangle:

125 * 2 + 25 * 2 = 300 cm.

4. Since all four sides of the square are equal, divide the perimeter by 4.

The side of the square is 300/4 = 75 cm.
Answer: The side of the square is 75 cm.