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查看: 2524|回复: 2
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请高手解决数学题，谢谢
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这是问题：
The total costs for a design project was $10,841. The project was carried out by technicians earning $137 per day and draftsmen earning $82 per day. If 98 man days were used on the project, how many man days were draftsmen employed?
谢谢。
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发表于 29-10-2016 08:32 PM
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Total costs $10,841
Total 98 man day
Technicians earning $137 per day
Draftsmen earning $82 per day
Technicians work 51 day x $137 = $6,987
Draftsmen work 47 day x $82 = $3,854
Total $6,987 + $3,854 = $ 10841 |
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发表于 20-1-2017 01:26 PM
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X - man days were technician employed
y - man days were drafts men employed
137x+82y=10841,
were x+y=98
x=98-y,
hence, 137(98-y)+82y = 10841
13426-137y+82y = 10841
y = 47 man days
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