Question
The ratio of the area of Rectangle A to that of Rectangle B to that of Rectangle C is 7 : 4 : 3. 221 of Rectangle A and 19 of Rectangle C are shaded. The shaded area is 60 cm2. Find the total unshaded area of the figure.
4 m

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The ratio of the area of Rectangle A to that of Rectangle B to that of Rectangle C is 7 : 4 : 3. 221 of Rectangle A and 19 of Rectangle C are shaded. The shaded area is 60 cm2. Find the total unshaded area of the figure.