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。

推荐阅读：
Number of Steps to Reduce a Number in Binary Representation to O　 Recursive Depth First Search Algorithm to Compute the Diameter o　 Find the largest palindrome From the product of two 3-digit numb　 What is the largest prime factor of the number 600851475143 ?　 Can we Construct K Palindrome Strings?　 Sum of Even Fibonacci Numbers　 Sum of Multiples of 3 and 5　 How to Design Underground System using Several Hash Maps?　 How to Remove Zero Sum Consecutive Nodes from Linked List using 　 Depth First Search and Breadth First Search Algorithm to Open th