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?
First, we need to find out how many sacks of oranges are being harvested per day. 8 sacks per day is the same as 8/1 sacks per day, so we can say that they are harvesting 8/1 sacks of oranges per day. 

Next, we need to find out how many days it will take to harvest 24 sacks of oranges. 24 sacks of oranges is the same as 24/1 sacks of oranges, so we can say that it will take 24/1 days to harvest 24 sacks of oranges. 

Now, we need to find out how many days it will take to harvest 24/1 sacks of oranges if they are harvesting 8/1 sacks of oranges per day. 24/1 days is the same as 24/1 x 1/8 days, which is the same as 3/1 days. 

We can simplify 3/1 days to just 3 days, so we can say that it will take 3 days to harvest 24 sacks of oranges. 

Therefore the answer (numeric) is: 

3