数学题:一个玻璃瓶内原有盐是水的1/11

  • 时间:2020-06-07 17:57:17
  • 分类:数学世界
  • 阅读:161 次

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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