Atruck has a total of a pounds of fruit in boxes. how many boxes are on the truck if there are n pounds of fruit in each box?

Total number of boxes = a / n boxes

Explanation:
The total number of pounds that the truck carries is "a" pounds.
This amount is distributed in several boxes, each with "n" pounds.

This means that:
Total pounds = number of boxes * number of pounds in each box
a = number of boxes * n
number of boxes = a / n boxes

Hope this helps :)