He then went to see the oranges being harvested. He found out that they harvest 8 sacks per day. How many days will it take to harvest 24 sacks of oranges?
The first day, they harvest 8 sacks. 

The second day, they harvest 8 more sacks, for a total of 16 sacks. 

The third day, they harvest 8 more sacks, for a total of 24 sacks. 

It will take 3 days to harvest 24 sacks of oranges.