The figure, not drawn to scale, on the right shows 2 rectangles overlapping each other. The ratio of the shaded area to the area of Rectangle F is 5 : 11. The ratio of the shaded area to the area of Rectangle G is 2 : 7. Find the ratio of the unshaded area to the total area of the figure.
Rectangle F |
Shaded Area |
Rectangle G |
11 x 2 |
5 x 2 |
|
|
2 x 5 |
7 x 5 |
22 u |
10 u |
35 u |
The shaded area is the same for both rectangles.
LCM of 2 and 5 = 10
Total area of the figure
= 22 u + 35 u - 10 u
= 47 u
Unshaded area
= 47 u - 10 u
= 37 u
Unshaded area : Total area of the figure
37 : 47
Answer(s): 37 : 47