标题: [数学] 求助数学题 [打印本页]

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作者: 哈哈爸    时间: 2009-4-19 09:53     标题: 求助数学题

Teams X and Y work separately on two different projects.
On sunny days, team X can complete the work in 12 days
while team Y needs 15 days.
On rainy days, team X’s efficiency decreases by 50%
while team Y’s efficiency decreases by 25%.
Given that the two teams started and ended the projects at the same time,
how many rainy days are there?.

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作者: 阿弥陀佛    时间: 2009-4-19 11:12

12.

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作者: 哈哈爸    时间: 2009-4-19 15:38     标题: 回复 2#阿弥陀佛 的帖子

谢谢，能给出过程吗？.

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作者: 阿弥陀佛    时间: 2009-4-20 22:51     标题: 回复 3#哈哈爸 的帖子

设：晴天x天，雨天y天，两人总工程量分别为A，B。

1/12Ax+1/12A*(1-50%)y=A

1/15Bx+1/15B*(1-25%)y=B

x=6,y=12.

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