The length of the rectangular sports hall is 40m. Find the perimeter of the hall if its area is 200m².

We first need to calculate the width of the gym. To do this, we denote the width by x and compose an equation according to the condition of the problem:
40 * x = 200.
x = 200/40.
x = 5.
Let’s check the correctness of the solution to the equation:
40 * 5 = 200.
200 = 200.
This means that the width of the gym is 5 meters.
Let us determine its area by adding all four sides together, since the gym is rectangular.
P = 200 m + 200 m + 5 m + 5 m = 400 m + 10 m = 410 m.
Or:
P = 200 m * 2 + 5 m * 2 = 400 m + 10 m = 410 m.