A mixture of CaCO3CaCO_3CaCO3 and MgCO3MgCO_3MgCO3 weighing 1.84 g on heating leaves a residue weighing 0.96 g. If the percentage by mass of CaCO3CaCO_3CaCO3 in the original mixture is x%, what is the value of x/2?
27.18
32.50
41.25
54.35
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