数学题:有一杯糖水，糖与水的重量比是1:20，如果再加2克糖，这杯水重44克，糖水中水的重量是多少?

数学题解答：这是一道关于按比例分配的数学问题。已知“糖与水的重量比是1:20”，先用“如果再加2克糖，这杯水重44克”算出未加2克糖时的糖水重量，然后求出每份的重量，就好算了。

未加2克糖时的糖水重量：44-2＝42（克）

水的重量：42÷（1+20）×20＝40（克）

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