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.
What is the ratio of the number of successful start-ups to that of the number of unsuccessful start-ups in the Fin-tech sector?
1
3 ∶ 4
2
13 ∶ 18
3
23 ∶ 32
4
13 ∶ 19