Plz explain properly, i have this on my math final tmr a kindergarten teacher has 22 1/2 cups of juice to be divided equally among her students. if each student is to receive 1 1/4 cups of juice, how many students are there?

You are to calculate the # of students, based upon the starting volume of juice and the amount each student receives.

                                                     22 1/2 cups
This # of students is equal to
                                                [1 1/4 cup / student ]

and this could be found easily by dividing 22.5 by 1.25:  18.  There are 18 students.