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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