刘鑫家的闹钟到了整点就敲响，早晨六点敲6下用了5秒，九点时敲完用了8秒，那么到深夜二十四点时敲完要用______秒．

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脖子二道沟共回答了16个问题 | 采纳率93.8%: 解题思路：“早晨六点敲6下用了5秒，”即早晨敲6-1个间隔用了5秒，由此求出敲一个间隔所用的时间，要求深夜二十四点时敲完要用的时间，也就是求敲24-1个间隔所用的时间，因此用敲一个间隔所用的时间乘（24-1）即可．
5÷（6-1）×（24-1），
=1×23，
=23（秒），
答：深夜二十四点时敲完要用23秒．
故答案为：23．

点评：
本题考点：植树问题．

考点点评：解答本题关键是知道，间隔数=敲的下数-1，注意本题也可以利用“九点时敲完用了8秒，”求出敲一个间隔所用的时间．; 1年前

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