He then went to see the oranges being harvested. He found out that they harvested 30 sacks of oranges. How many days did it take to harvest them if they harvested 5 sacks of oranges per day?
1. They harvested 30 sacks of oranges. 
2. They harvested 5 sacks of oranges per day. 
3. They harvested 30 sacks of oranges in _____ days. 

To solve this problem, we can use division. We know that they harvested 30 sacks of oranges, and we know that they harvested 5 sacks of oranges per day. So, we can divide 30 by 5 to find out how many days it took them to harvest 30 sacks of oranges. 

30 divided by 5 equals 6. 

It took them 6 days to harvest 30 sacks of oranges.