An amusement park sold a total of 68 tickets. 43 of the tickets were child tickets, and the rest were adult tickets. What is the ratio of the number of adult tickets to the number of child tickets? Write your answer as a fraction. Use a slash ( / ) to separate the numerator and denominator.
The number of adult tickets is 68 - 43 = <<68-43=25>>25.
The ratio of the adult tickets to the child tickets is 25/43. Answer: \boxed{\frac{25}{43}}.