The total weight of a box, 20 plates and 30 cups is 4.8kg. The total weight of the box, 40 plates and 50 cups is 8.4kg. What is the total weight of the box, 10 plates and 20 cups?
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3 \text{ kg}
3.2 \text{ kg}
3.6 \text{ kg}
4 \text{ kg}
4.2 \text{ kg}
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Intermediate Mathematical Challenge 2015 (2015)
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