Answer:
number of small boxes = 65
number of large boxes = 50
Step-by-step explanation:
Let the small boxes be represented by s
Let the large boxes be represented by b
b+s = 115 (if you add the number of small boxes and large boxes)
50b + 25s = 4125 (The cost of the boxes has to be 4125)
Solve the two equations simultaneously
s = 65
b = 50