Question

跪求啊！我今晚就要知道！谢 是方程帮我解答！！！！！！求求求

整理一批图书 有一个人做由40小时完成 现计划由一部分人先做4小时 再增加2人和他们一起做8小时 完成这项工作 假设这些人的工作效率相同 具体安排几个人工作？

Answer 1

设开始x人做4小时，
4x/40+(x+2)8/40=1 x=2

Answer 2

Finally ended, and the life of my Grade 11, Looking back, some things Bukanhuishou, but some things still seem worthy of the occasion. To prepare for this test, we review the approaching three months,. Examination of how that is not bad, very simple issue, clearance, no problem! Oh, I think my students are like me, bless them.
This year's college entrance examination results have come out, before the students are also good, but also play the bad, should take priority! Alas, the days of contingency situation ah! Some of the more than 550 test, saying that preparations for the amount of repetition, I really wonder, but some things they can not make decisions!
Hope that there will be, or to talk about my own! This semester I, like restoration of a number of a foot injury, the Chinese medicine hospital to do a few courses of electrotherapy, Carter Phillip good effect, the summer I go back and come back to do some treatment!
I hope that my legs could resume as early as 1:00, I was also mixed continue my basketball career? I believe we will see my feet clear progress!
Yi hours in a European Cup final will be started this year, although some of the Chinese soccer is disappointing, but we also see hope! I hope that tonight's final, Spain beat Germany can, the winner! Spanish support!
A holiday back, is a Grade 11 end of the semester, the third year is also the beginning of the new school year, hope that we can work! There are 10 months or so, on the fast Aoguo Qu喽!
If God give me a chance to play basketball, I will choose, because I have fallen in love with him! For my favorite people, or a college entrance examination, such as a repeat! While this is very tough, but to insist on!
To tell the truth, I have been a lonely person!

Answer 3

把工程总量看成1， 那么工作效率是1/40，设先安排x人做， 那么方程是：1/40*x*4+1/40*(x+2)*8=1 算出来x=2人。所以，这个工程先安排2人做4小时，然后增加2人做8小时。