题目内容：
在浓度为40%的糖水中加入5千克水，使浓度变为30%。现在要使糖水浓度变为50%，需要再加（ ）千克糖。 
参考答案：
答案解析：
单选题：在浓度为40%的糖水中加入5千克水，使浓度变为30%。现在要使糖水浓度变为50%，需要再加（ ）千克糖。
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