Uncle Li raised 600 chickens and raised 1 / 5 more ducks. How many ducks does Uncle Li raise?

Uncle Li raised 600 chickens and raised 1 / 5 more ducks. How many ducks does Uncle Li raise?

In this problem, if the chicken unit is "1", the score of duck should be (1 + 1 / 5) = 6 / 5
The process of solving the problem is as follows
The number of ducks: 600 × (1 + 1 / 5) = 720
A: Uncle Li has 720 ducks