The width of a rectangle is 2/3 its length. Given that the perimeter of 2 such rectangles is 90 cm, find the width of the rectangle.
Since the perimeter of two such rectangles = 90.....the perimeter of one must be 45
So
2 ( W + L) = 45
2 ( (2/3)L + L) = 45
2 ( (5/3)L ) = 45
(10/3)L = 45
L = 45 (3/10) = 13.5
W = (2/3) (13.5) = 9
+318 
