Because she has square false teeth, my wife makes square bites (with sides of 3 cm) when she eats toast. What area is left after she takes four bites in a square slice of toast that measures 12 \text{ cm} \times 12 \text{ cm}?
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36 \text{ cm}^2
108 \text{ cm}^2
132 \text{ cm}^2
140 \text{ cm}^2
144 \text{ cm}^2
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Primary Mathematics Challenge 2018 (2018)
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