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一隊少先隊員乘船過河,如果每船坐15人,還剩9人,如果每船坐18人,剛好剩余1只船,求有多少只船?

2019-11-07 19:16:48  來源: 小升初網     閱讀次數:
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一隊少先隊員乘船過河,如果每船坐15人,還剩9人,如果每船.jpg

  一隊少先隊員乘船過河,如果每船坐15人,還剩9人,如果每船坐18人,剛好剩余1只船,求有多少只船?

  答案解析:

  解法一:

  設船數為X,則

 ?。?5X+9)/18=X-1

  15X+9=18X-18

  27=3X

  X=9

  答:有9只船。

  解法二:

  (15+9)÷(18-15)=8只船 --每船坐18人時坐了8只船

  8+1=9只船

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