帮忙解这道数学题

大意是：

Two A & B build a rail road. It will take 6 days for Team A only, and 12 days for Team B only. Now Team A worked on it for several days then left, Team B continued to finish it. The total days spent by both teams are 10 days. Please figure out how many days Team A spent and how many days team B spent.

通过画图和排列组合我能知道答案，可不会列式子。小孩也不会方程。

所有跟帖： 

• 这样说，看看 -hobo-hobo- ♀ (216 bytes) () 05/20/2010 postreply 11:00:43

• 文豪数学也这么强啊 -事儿- ♀ (0 bytes) () 05/20/2010 postreply 11:02:30

• 这叫算数，跟数学还有距离，：）） -hobo-hobo- ♀ (0 bytes) () 05/20/2010 postreply 11:05:53

• 这个比用代数做难多了 -事儿- ♀ (16 bytes) () 05/20/2010 postreply 11:08:03

• 用代数做 -shunli2- ♀ (61 bytes) () 05/20/2010 postreply 11:38:49

• a2,b8 -云中飞燕- ♀ (113 bytes) () 05/20/2010 postreply 11:01:57

• 回复：帮忙解这道数学题 -spring_breeze- ♀ (135 bytes) () 05/20/2010 postreply 11:04:00

• A队一天做完的活,B队要两天. -胡梦绿- ♀ (56 bytes) () 05/20/2010 postreply 11:05:25

• 方程 -微风徐来-- ♀ (39 bytes) () 05/20/2010 postreply 11:10:33

• 忘了说是小学二年级的作业 -nelove- ♀ (146 bytes) () 05/20/2010 postreply 11:12:22

• 想看图表算法 -婪妈- ♀ (0 bytes) () 05/20/2010 postreply 11:18:14

• 回复：帮忙解这道数学题 -ninyxu- ♀ (287 bytes) () 05/20/2010 postreply 11:22:51

• 回复：帮忙解这道数学题 -oops_yz- ♀ (222 bytes) () 05/20/2010 postreply 11:31:11