数学题:化肥厂计划用15天生产化肥4500吨，钱5天平均每天生产340吨，后又提高了产量，结果提前3天就完了工，后几天平均每天生产化肥多少吨？（用方程解）

数学题解答：设后几天每天生产x吨。

340×5 + (15-5-3)x = 4500

1700 + 7x = 4500

7x = 2800

x=400

推荐阅读：
How to Check If A String Is a Number (Numeric) using Regex (C++/　 The Bash Programming Tutorial: Compute the GCD (Greatest Common 　 How to Re-Number the Files Sequentially on Windows using Batch P　 How to Split a String in Balanced Strings?　 Finding Out the Longest Arithmetic Subsequence of Given Differen　 How to Count the Prime Number of Set Bits in Binary Representati　 How to Create a Mock Echo Soap/REST API using SoapUI?　 How to Partition Array into Disjoint Intervals?　 The Complex Number Multiplication Function　 Beauty Blogger Dies In Freak Accident While On Vacation