Pegs are driven in at the corners and sides of the rectangle at a distance of 4 m from each other.

Pegs are driven in at the corners and sides of the rectangle at a distance of 4 m from each other. How many pegs are hammered in if the rectangle is 20 m long and 8 m wider?

Pegs are driven in at all corners and sides. Pegs are driven in every 4 meters. The rectangle is 20 meters long and 8 meters wide. Find the number of pegs driven into the rectangle.

To begin with, be sure to take into account that pegs are driven in the corners. Each of these pegs are common to both sides, that is, each side already has 2 pegs initially.

We get that the width has 2 pegs at the edges, we drive in another one in the center and we have three pegs.

The length has 2 pegs, drive in three more and get 5.

Accordingly, the total is equal to:

4 + 2 * 1 + 2 * 3 = 12.