A group of farmers need to harvest 2 farms, one of which is twice the size of the other.
They worked half of the first day on the bigger farm. Then they split into two equal groups to work on harvesting both farms.
By end of the first day, the bigger farm was completely harvested. The smaller farm had a some work left to be done, but a single farmer was able to finish harvesting it by the end of the second day.
How many farmers were in the group?