Answer:
4 groups
Step-by-step explanation:
The question asks, "What is the greatest number of groups the principal can make?" so, you have to find the GCF (Greatest Common Factor)
28: 1, 2, <u>4</u>, 7, 14, 28
32: 1, 2, <u>4</u>, 8, 16, 32
As you can see, 4 is the greatest common factor here.
So, the greatest number of groups that the principal can make is 4 groups.