Malay
颜色选择
阳光橙
深夜黑
天空蓝
葡萄紫
薄荷绿
深海蓝
首页
论坛
佳礼报道
新闻
搜索
2088
查看
2
回复

请高手解决数学题,谢谢

[复制链接]

楼主: skyline89       显示全部楼层   阅读模式

楼主
发表于 20-9-2015 02:09 PM | 显示全部楼层 |阅读模式
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。
回复

使用道具 举报

发表于 29-10-2016 08:32 PM | 显示全部楼层
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
回复

使用道具 举报

发表于 20-1-2017 01:26 PM | 显示全部楼层
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

回复

使用道具 举报

您需要登录后才可以回帖 登录 | 注册 | 登入

本版积分规则

 WeChat
 CARI App
Get it FREE Google play
 Instagram
cari_malaysia
FOLLOW
- 版权所有 © 1996-2020 Cari Internet Sdn Bhd 佳礼网络有限公司 (483575-W) -
Private Cloud provided by IPSERVERONE
0.211567s Gzip On
快速回复 返回顶部 返回列表