Variable represent a ratio

Question

How can you make a variable represent a ratio between two other variables?

Answer 1

Give proper description with example you want like this
a =b/c .....?

Answer 2

What programming language?

To find ratios, divide a and b by their greatest common divisor.

Here is a Python example:
https://code.sololearn.com/czfqOoGiM0ad/?ref=app