Answer: k = 5
Explanation:
Box A has more counters than box B
3 * 4 = 12
4 + 8 = 12
So if k was equal to 4, then both boxes would have the same amount.
3 * 5 = 15
5 + 8 = 13
15 > 13
If k was equal to 5, then Box A would contain more counters than Box B.