To find the unit rate, we must follow the following procedure:
Divide the total number of water bottles into case numbers.
We have then:
[tex] R =\frac{162}{9} [/tex]
Rewriting the unit rate we have:
[tex] R = 18 [/tex]
Answer:
The unit rate of bottles per case is given by:
[tex] R = 18 [/tex]