Question
The ratio of the area of Rectangle X to that of Rectangle Y to that of Rectangle Z is 7 : 5 : 3. 221 of Rectangle X and 19 of Rectangle Z are shaded. The shaded area is 87 cm2. Find the total unshaded area of the figure.
4 m

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The ratio of the area of Rectangle X to that of Rectangle Y to that of Rectangle Z is 7 : 5 : 3. 221 of Rectangle X and 19 of Rectangle Z are shaded. The shaded area is 87 cm2. Find the total unshaded area of the figure.