You've got three boxes with apples. You know that:
1. In box A there are 6 apples less, or double the number of apples, than in box B.
2. in box C there are 5 apples more than in box A, or 5 less apples than in box B.
3. There are at least two boxes with the same number of apples in them.
How many apples are in each box?