Answer :
For ms Morgan it tells you 30% and 120 students so the thing you don’t know is the part.
30% of 120 is 36
For mr Gregory it tells you 27 is 15% so you don’t know the total amount of students he has (whole)
27 is 15% of 180
30% of 120 is 36
For mr Gregory it tells you 27 is 15% so you don’t know the total amount of students he has (whole)
27 is 15% of 180