9 plates in each stack.
Given:
Total number of plates is, N = 36.
Number of racks is, n (r) = 4.
The objective is to find the number of plates in each stack.
Since it is given that each stack have the same number of plates.
Consider the number of plates in each stack as x.
Then, the value of x can be calculated as,
Thus, the value of x is 9.
Hence, the number of plates in each stack is 9.