The sum of the side length of a square and the width of a rectangle is 20 cm, the perimeter of a square is one and one third of the perimeter of a rectangle, and the width of a rectangle is 4 / 5 of the length. How much is the area of the square and rectangle and the fact How much is the area sum of square and rectangle?
Rectangle circumference = (W + L) * 2 = 3.6 * l
Square perimeter = rectangle perimeter * 4 / 3
=3.6 * 4 / 3 * length = 4.8 * length
Square side length = square perimeter / 4 = 1.2 * length
Square side length + width = 1.2 * length + 0.8 * length = 2.0 * length = 20
Length = 20 / 2.0 = 10
Width = 0.8 * length = 8
Square side length = 1.2, length = 12
Square area = 12 * 12 = 144
Rectangle area = 10 * 8 = 80