Answer:
2 package burgers, and 5 package buns
Explanation:
Let us find the least common multiple of 15 and 6, which is 30!
If you buy 30 burgers, you would buy two packages (30/15=2)
If you buy 30 buns, you would buy 5 packages (30/6=5)
You would also have No items left over!
I hope this helped! :)