Answer:
Box 1: 5
Box 2: 5
Box 3: 5
Box 4: 15
Step-by-step explanation:
the three boxes have the same number of boxes, it has 5 because 5+ 5 + 5 = 15.
so the fourth box will have 15 because that's the sum of the three boxes, 15 + 15 = 30.
Hope this helps!