A company contracts to paint 3 houses. Mr. Brown can paint a

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A company contracts to paint 3 houses. Mr. Brown can paint a house in 6 days while Mr. Black would
take 8 days and Mr. Blue 12 days. After 8 days Mr. Brown goes on vacation and Mr. Black begins to work for a period of 6 days. How many days will it take Mr. Blue to comlete the contract?
这是一个智力题,求解答...

Brown干了8天.完成了1整栋零六分之二
Black干了6天.完成了四分之三栋
3栋减去1又3分之1再减去四分之三
结果等于十二分之十一.
也就是说当BLUE开始干活的时候,还有十二分之十一没有做.他做一整栋要12天,现在只需要11天就能干完了.
小学算术,用英文来搞...

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