He then went to see the oranges being harvested. He found out that they harvest 18 sacks per day. How many oranges do they harvest per day if each sack contains 19 oranges?
1. He went to see the oranges being harvested. 
2. He found out that they harvest 18 sacks per day. 
3. How many oranges do they harvest per day if each sack contains 19 oranges?

We are trying to find out how many oranges are being harvested per day. We are given that 18 sacks are being harvested per day, and each sack contains 19 oranges. 

To solve this, we can multiply 18 by 19 to find out how many oranges are being harvested in total per day. 

18 x 19 = 342 

Therefore, 342 oranges are being harvested per day.