The length of a rectangular playground is 40 meters. Find the width if the perimeter is 120 meters.

In order to find the perimeter of a rectangle, we will compose and solve an equation with one variable.

Let’s see what is given to us in the problem statement.

From the condition, the length of the sports ground is known, which has the shape of a rectangle – 40 meters. We also know the perimeter of the sports ground – 120 meters.

The perimeter of the site can be found using the formula:

P = 2 (a + b);

Let’s denote by x meters the width of the site.

2 (x + 40) = 120;

x + 40 = 120: 2;

x + 40 = 60;

x = 60 – 40;

x = 20 meters width of the sports field.