For the fence of the rectangular section, metal shields, each 3 meters long, were brought. the width

For the fence of the rectangular section, metal shields, each 3 meters long, were brought. the width of the plot is 36 meters, and the length is 120 meters. How many shields were brought to fence the site.

To solve the problem, you first need to determine the length of the boundaries of the site, which is also its perimeters.
To do this, you need to find the doubled amount of its parties.
In this case, we get:
2 * (120 + 36) = 312 meters.

Since we know that the length of one brought shield is 3 meters, in order to determine the total number of shields that were brought to fence the plot, it is necessary to divide the length of the plot boundaries by the length of one shield.
In this case, we get:
312/3 = 104 shields.