Question

He number of cups in a 18.4 cm high stack is:

Answer 1

You'll need to share the height of each cup.

Otherwise, use h to represent this height, in which case the answer would be
18.4 cm / h(cm/cup). "cm" will cancel here, so that you'll be left with

18.4
------ cups (answer)
h

Answer 2

thanks for the information. Whats the question you are trying to ask?