Calculate the area of a rectangle whose perimeter is 20 m, and the length of one side is one third of the length

Calculate the area of a rectangle whose perimeter is 20 m, and the length of one side is one third of the length of the other side.

1. Determine the width of the rectangle. Let the width be a meters, then the length will be 3 meters. Let’s make the equation:

(a + 3a) x 2 = 20;

4a = 20: 2;

4a = 10;

a = 10: 4;

a = 2.5 m;

2. Determine the length of the rectangle:

2.5 x 3 = 7.5 m;

3. Determine the area of the rectangle:

2.5 x 7.5 = 18.75 m ^ 2.

Answer: the area of the rectangle is 18.75 m ^ 2.