The following pie charts show the number of start-ups started in various sectors since 2016 and the number of successful start-ups in those sectors respectively.
Find the ratio of the number of successful start-ups in entertainment sector to the total number of start-ups in entertainment since 2016.
1
5 ∶ 16
2
5 ∶ 17
3
7 ∶ 16
4
25 ∶ 81