He then went to see the oranges being harvested. He found out that they harvest 37 sacks per day and discard 17 of them. How many oranges do they harvest per day if each sack contains 38 oranges?
1. He sees 37 sacks being harvested per day. 
2. He sees that 17 of those sacks are discarded. 
3. He knows that each sack contains 38 oranges. 

So we want to find out how many oranges are in 37 sacks. We can do this by multiplying: 

37 sacks x 38 oranges per sack = 1,386 oranges per day