Final answer:
The proportion of tickets sold at the theme park that are adult tickets is 60%, which is calculated by subtracting the percentages of child and senior tickets (25% and 15%, respectively) from the total of 100%.
Step-by-step explanation:
The question asks about the proportion of tickets sold at a theme park that are neither child tickets nor senior tickets. Based on the information provided, 25% are child tickets and 15% are senior tickets. To find the proportion of the remaining tickets, which are presumably adult tickets, we can subtract the percentage of child and senior tickets from the total, which is always 100%.
So, the calculation would be as follows: 100% - 25% (child tickets) - 15% (senior tickets) = 60% adult tickets.
Therefore, the proportion of tickets sold that are adult tickets is 60%.