Imagine taking a number, multiplying it by something, and getting 1. Sounds easy! Only, the original number is not 1. Let's say the number is 15. In order to get 1, you'll multiply 15 by its multiplicative inverse, which is 1/15.
How exactly did I get 1/15? Well, to visualize it better we can write 15 as 15/1. Then it's crystal clear.
15/1 became ... 1/15. Boom!
This was one example. Now let's see what we can do with 2/3.
2/3 becomes ... 3/2.
Answer:
3/2