两棵树上共有麻雀24只

  • 时间:2020-06-22 15:49:22
  • 分类:数学世界
  • 阅读:143 次

两棵树上共有麻雀24只,第一棵树飞到第二棵树上5只,又从第二棵树上飞走7只到第一棵树,这时第一棵树上的麻雀的只数是第二棵的2倍。原来每棵树上各有几只?

本来题目中鸟是25只,可惜这是一道错题,只好把25改成24了。解答如下:

24÷(1+2)=8(只)……第二棵现在

8×2=16(只)……第一棵现在

8+7-5=10(只)……第二棵原来

16-7+5=14(只)……第一棵原来

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