初一数学问题：某运输队送一批货物，计划20天完成，实际每天多运送5t，结果不但提前2天完成任务并多运了10
求这批货物有多少吨？原计划每天运输多少吨？
推荐回答（4个）
设原来有X吨
(X+10)/18-X/20=5
X/180=80/18
X=800
800÷20=40吨
这批货物有800吨，原计划每天运输40吨
解：设原计划每天运x吨，则这批货物有20x吨。
（20x+10）/（x+5）=20-2
解得x=40
则20x=800
答：这批货物共800吨，原计划每天运输40吨
设货物一共Y吨，其中每天计划运X吨。由题意可知：
Y＝20X；
（X+5）×（20－2）＝Y+10；
由此可知：
X=40;
Y=800;
参看http://zhidao.baidu.com/question/77701939.html
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