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40 g of thick paper contains 12 sheets
1g of thick paper contains 12/40 sheets
1 kg of thick paper contains 12/40 * 1000 sheets
5/2 kg of thick paper contains 12/40 * 1000 * 5/2 = 750 sheets
Therefore 750 sheets of thick paper weigh 2 and 1/2 kilograms
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