Question
The ratio of the area of Rectangle Q to that of Rectangle R to that of Rectangle S is 7 : 4 : 2. 221 of Rectangle Q and 16 of Rectangle S are shaded. The shaded area is 27 cm2. Find the total unshaded area of the figure.
4 m

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The ratio of the area of Rectangle Q to that of Rectangle R to that of Rectangle S is 7 : 4 : 2. 221 of Rectangle Q and 16 of Rectangle S are shaded. The shaded area is 27 cm2. Find the total unshaded area of the figure.