Word Problem

Well the rectangles appear  to be squares.....

Let their side length = 1

So     the top left shading is a triangle with a base of  6 and a height of 1

So its area  =(1/2) (6)(1)   = 3

The bottom right shading  has as base of 3  and a height of 1....so its area=  (1/2)(3)(1)  =3/2

And  the two  shaded square   each have an area  of 1  so their  combined   area   = 2

And the total area = the area of 12  squares with a side  of 1  =12

So

shaded area to  total area =    ( 3 + 3/2 + 2)  /12  =   ( 6.5)  /12   =  13/24