Gery wants to fence a rectangular field whose area is 1200 sq.m. He has only 100 meters of fencing so he decided to fence only the three side of the rectangle letting the wall be the fourth side. How wide the rectangle should be?

Answer 1

If the width is x, then the length is 100-2x. SO, the area is

x(100-2x) = 1200
2x^2 - 100x + 1200 = 0
x^2 - 50x + 600 = 0
...