Two rectangles B and C, not drawn to scale, overlap at D. D is the shaded area which is
12 of Rectangle B and
15 of Rectangle C. If the length of Rectangle B is 10 m and its breadth is 6 m, what is the area of the unshaded part of rectangles B and C?
| |
B |
C |
Difference |
| Total areas |
2 u |
5 u |
3 u |
| Shaded part |
- 1 u |
- 1 u |
|
| Unshaded parts |
1 u |
4 u |
3 u |
The overlapping shaded part of rectangles B and C is the same.
Area of Rectangle B
= 10 x 6
= 60 m
2 Area of Rectangle B = 2 u
Area of Rectangle C = 5 u
2 u = 60
1 u = 60 ÷ 2 = 30
Area of unshaded parts of rectangles B and C
= 1 u + 4 u
= 5 u
= 5 x 30
= 150 m
2 Answer(s): 150 m
2 
