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：
8 Best Affiliate Marketing Plugins For Your Blog　 How Many Squares/Rectangles Does a Rubik Cube Have?　 Find the 10001st Prime Number　 The Difference Between Sum of Squares and Square of the Sum　 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