Answer:
38/7 or in mixed number: 5 3/7
Explanation:
6 3/9 = 57/9 in improper fraction form.
If you multiply that with 6/7, you get 342/63.
Simplifying 342/63 as much as possible, you get 38/7.
If you change 38/7, you end up with 5 3/7
Hope this helps :)