The area of the rectangle is 600 dm2, and its width is equal to the side of the square

The area of the rectangle is 600 dm2, and its width is equal to the side of the square, the perimeter of which is 80 dm. What is the length of the rectangle?

We will solve this problem by actions.

1. Find the side of the square.

Since the square has 4 sides, the lengths of which are equal, the side of the square is equal to one fourth of its perimeter.

80 dm: 4 = 20 dm.

2. The width of the rectangle is equal to the side of the square and is equal to 20 dm.

3. Knowing the area of the rectangle and one of its sides, you can calculate the unknown side by dividing the area by the known side.

600 dm2: 20 dm = 30 dm.

Answer: The length of the rectangle is 30 dm.