从右往左数,小兰排在第几个?

  • 时间:2020-05-20 15:29:31
  • 分类:数学世界
  • 阅读:67 次

同学们排成一队做游戏,小兰左边的同学占总人数的2/3,右边的同学占总人数的1/4,从右往左数,小兰排在第几个?

数学题解答:把总人数看作单位“1”,减去小兰左右两边同学所占的分数,得到小兰占总人数的:1 - 2/3 - 1/4 =1/12,总人数是:1 ÷ 1/12 =12(人)

小兰右边有:12 × 1/4 = 3(人),小兰在第几位?3+1=4,答:从右往左数,小兰在第4位。

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