数学题:一个玻璃瓶内原有盐是水的1/11，加进15克盐后盐占盐水的1/9，瓶内原有盐水多少克？

数学题解答：后来加盐后“盐占盐水的1/9”，那么盐看成1份，盐水看成9份，其中的水就占9-1=8份，此时盐占水的1÷8=1/8

原来“盐是水的1/11”，现在“盐占水的1/8”，这是因为盐增加了，但是水没有变。

根据加入的15克盐占水的（1/8 – 1/11），可以算出有多少克水。

15 ÷ （1/8 – 1/11）=440（克）

所以瓶内原有盐水：440 + 440 × 1/11 = 480（克）

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