Superman uses 16 meters of fencing to create a rectangular field. If one side is already built, and the width is known to be 4 meters, what is the area encompassed by the rectangular fence?

m^{2}

Since we don’t need one side of the width, Superman
doesn’t need fencing for that side. He needs to build two lengths and one
width, which we know is 4 meters long. Thus, the length of the rectangular
fence is (16 - 4) ÷
2 = 6 m. The area of the field is therefore 6 × 4 = 24 m^{2}.