The width of the rectangular garden plot is 7.8 m less than its length and the perimeter is 100 m, find the area of the plot.

Answer: 609.79 m2.
Suppose the length of the garden plot is X m.
Then the width of the section will be (X – 7.8) m.
Considering that the perimeter of the section is the sum of all its lengths, we get:
2 * X + 2 * (X -7.8) = 100
2X + 2X – 15.6 = 100
4X = 115.6
X = 28.9,
those. the length of this garden plot is 28.9 m, and its width:
28.9 – 7.8 = 21.1 (m).
The garden area will be:
21.1 * 28.9 = 609.79 (m2).