The number of plates being used by Mr.Martin are 4
Solution:
According to question Martin buys total 36 muffins for a class Breakfast which he places them on the plates in such a way that there are 9 muffins on each plate
We have to determine the number of plates used by Mr. Martin to do this
Let the number of plate being used be denoted by ‘n’


Hence the number of plates being used are 4