应用题,英语!A contractor agreed to finish a project in 50days.He employed 120men who worked 9hours in a day.After 20 days,he found that only 1/3of the project was completed.How many more men should he employ to finish the work on time if each ma

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应用题,英语!Acontractoragreedtofinishaprojectin50days.Heemployed120menwhoworked9hoursinaday.After20days,h

应用题,英语!A contractor agreed to finish a project in 50days.He employed 120men who worked 9hours in a day.After 20 days,he found that only 1/3of the project was completed.How many more men should he employ to finish the work on time if each ma
应用题,英语!
A contractor agreed to finish a project in 50days.He employed 120men who worked 9hours in a day.After 20 days,he found that only 1/3of the project was completed.How many more men should he employ to finish the work on time if each man now worked 10 hours a day?

应用题,英语!A contractor agreed to finish a project in 50days.He employed 120men who worked 9hours in a day.After 20 days,he found that only 1/3of the project was completed.How many more men should he employ to finish the work on time if each ma
目前已经完成120*9*20=21600个人工时,相当于1/3的项目进度
因此余下的2/3项目相当于21600*2＝43200个人工时
现在起每人每天做10小时,要在30天内完成,需要43200/30/10=144人
因此,需要增加的工人人数为144-120＝24人

解 设还需要X人。
（120+X)*10*30=2*120*9*20
X=24

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