Final answer:
The ratio, in simplest form, of the number of fair tickets to the number of soul night tickets is 21:25.
Step-by-step explanation:
The ratio of the number of fair tickets to the number of soul night tickets can be found by dividing the number of fair tickets by the number of soul night tickets.
Ratio = Number of fair tickets / Number of soul night tickets
Ratio = 42 / 50
Since both numbers are divisible by 2, we can simplify the ratio further:
Ratio = 21 / 25
Therefore, the ratio, in simplest form, of the number of fair tickets to the number of soul night tickets is 21:25.