数学题：回收1千克废纸，可生产0.8千克再生纸。四一班有54名学生，每人每天回收1千克废纸，5月份（31天）回收的废纸可生产多少千克的再生纸？

数学题解答：54×1×31×0.8=1339.2（千克）

推荐阅读：
7 Online Marketing Tools You Need to Master in 2016　 How to Compute the Min Cost of Climbing Stairs via Dynamic Progr　 The Algorithm to Make Words Bold in HTML　 The O(N) Increasing Triplet Subsequence Algorithm　 How to Compute the Greatest Common Divisor of Strings?　 How to Design a Tic-Tac-Toe Game?　 The Facebook Initial Coding Interview Experience　 Facebook Onsite Interview Preparation Part 2: Coding Questions　 The Process Killing Algorithms using Depth First Search or Bread　 Breadth-First Search Algorithm to Solve Puzzle (Rotting Oranges)