The figure, not drawn to scale, shows a rectangle, JKLM, which is divided in 4 parts, N, P, Q, and R. The ratio of the area of R to the area of Q is 1 : 2. The ratio of the area of Q to the area of P is 9 : 10. If the area of N is 264 cm
2, what is the area of the rectangle JKLM?
R |
Q |
P |
N |
1x9 |
2x9 |
|
|
|
9x2 |
10x2 |
|
9 u |
18 u |
20 u |
11 u |
Area Q is the repeated identity.
LCM of 2 and 9 = 18
Half of the area of the rectangle
= Area R + Area P
= 9 u + 20 u
= 29 u
Area of N
= Half of the area of the rectangle - Area Q
= 29 u - 18 u
= 11 u
11 u = 264
1 u = 264 ÷ 11 = 24
Area of the rectangle
= 29 u x 2
= 58 u
= 58 x 24
= 1392 cm
2 Answer(s): 1392 cm
2