The squares have same area thus if we suppose that the area of one of them is A the other one has a area of A .
The shaded area is 20/100 × A thus the unshaded area is ( 80/100 × A )+ ( 80/100 × A ) , So the unshaded area is 160/100 × A .
Thus the ratio of the shaded area of the figure to unshaded area of the figure is :
( 20A / 100 ) ÷ ( 160A / 100 ) =
A / 100 s are simplify
20 ÷ 160 =
2 ÷ 16 =
1/8
