Answer:
1 clipboard per box
Explanation:
First, multiply 4 by 5 (because we need to see how many supplies there are already taken up)
4x5= 20
Next, subtract 25 from 20 (to see how many total clipboards there are)
25-20= 5
Since there are 5 boxes, we divide the number of clipboards(5) by the number boxes(5):
5/5= 1
Bam