He then went to see the oranges being harvested. He found out that they harvest 13 sacks per day. How many oranges do they harvest per day if each sack contains 6 oranges?
1) He went to see the oranges being harvested. 
2) He found out that they harvest 13 sacks per day. 
3) How many oranges do they harvest per day if each sack contains 6 oranges?

We are trying to find out how many oranges are being harvested per day. We are given that each sack contains 6 oranges, and that 13 sacks are being harvested per day. 

To find out the total number of oranges being harvested per day, we need to multiply the number of sacks being harvested per day (13) by the number of oranges in each sack (6). 

13 sacks x 6 oranges/sack = 78 oranges/day