The width of the rectangle is 40% of the length, and its perimeter is 68.6 cm. Find the area of this rectangle.

Let the length of the rectangle be equal to the variable a.

Therefore, its width can be represented as a * 40: 100 = 0.4a.

Since we know from the condition of our problem that its perimeter is 68.6 centimeters, then it is possible to write down the equation and determine its dimensions:

(a + 0.4a) = 68.6: 2;

1.4a = 34.3;

a = 24.5;

24.5 * 0.4 = 9.8.

Let’s determine what then its area will be equal to:

24.5 * 9.8 = 240.1.

Let’s translate the result into dm2:

240.1: 100 = 2.401.

Answer: 2.401 dm2.