小学四年级数学智力题， 求助。

我猜出答案的。请问怎么做和解释呢

A group of workers at Mr. Ramsey’s Ranch worked at the same pace. They were asked to mow two fields. One of the fields was twice as big as the other. They all mowed the larger field for half of a day. Then the group split in half. One group finished the larger field at the end of the day. The others mowed the smaller field. At the end of the day, there still remained a part to do. This part was finished by one worker in a single day. How many workers were there?

所有跟帖： 

• 4个人吗? -Ydad- ♂ (0 bytes) () 12/18/2015 postreply 18:57:02

• 4 -AlexisMom- ♀ (0 bytes) () 12/18/2015 postreply 18:58:18

• 学会画图，就容易了 -ca981- ♂ (87 bytes) () 12/18/2015 postreply 19:03:52

• 这道题不简单，在Beestar有答案和解释，仔细读两遍小孩就明白了 -孺将- ♂ (0 bytes) () 12/18/2015 postreply 19:04:09

• 大的Field,早上全部人干活，下午一半人干活，说明早上做了2/3,下午干了1/3. -CarriePanda- ♀ (262 bytes) () 12/18/2015 postreply 19:05:30

• 啊，汗，忘了乘二了！ -AlexisMom- ♀ (0 bytes) () 12/18/2015 postreply 19:05:55

• 这道题不简单，在Beestar有答案和详细解释，仔细读两遍小孩就明白了 -孺将- ♂ (0 bytes) () 12/18/2015 postreply 19:09:04

• 四年级学分数了吧 -keessa- ♀ (331 bytes) () 12/18/2015 postreply 19:18:47

• 8 -inner__peace- ♀ (0 bytes) () 12/18/2015 postreply 20:04:02

• 小场子3个人干一天的量，大场子6个人干一天的量，3+6-1=8，第一天8个人一起干的：） --百科-- ♀ (0 bytes) () 12/18/2015 postreply 20:50:07