Answer:
a/7
Explanation:
Another way to think of this is to use other fractions. 5/6 is 5 split into 6 pieces. The number you are splitting goes on the top, and the amount you are splitting into will be the bottom. 6 split into 3 pieces is 2 pieces. The apples split into 7 pieces would be a/7. 7/a would be 7 split into how many apples there are. The other two answers are multiplication and addition, which have nothing to do with the situation. Hope this helps!