First, you would need to create an equation for this problem. Let x represent the unknown number of spinners.
(5 × 27) + x = 189
Next, you would need to solve it.
(5 × 27) + x = 189
135 + x = 189
x = 54
There is a total of 54 spinners... But, we are not done!
Now, all you would need to divide the sum by the number of students.
54 ÷ 27 = 2
There are 2 spinners per student.
I hope this helps!