In the three alcohol solutions of A, B and C, the content of pure alcohol accounts for 48%, 62.5% and 2/3 respectively. It is known that the total amount of the three alcoholic solutions is 100 kg, and the amount of the alcoholic solution A is equal to the total amount of the two alcoholic solutions B and C. The percentage of pure alcohol contained in the three solutions will reach 56% after mixing. So, how many kilograms is the amount of pure alcohol in C?
在甲、乙、丙三个酒精溶液中，纯酒精的含量分别占48%、62.5%和2/3．已知三个酒精溶液中总量是100千克，其中甲酒精溶液量等于乙、丙两个酒精溶液的总量．三个溶液混合后所含纯酒精的百分数将达56%．那么，丙中纯酒精的量是几千克？
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