Final answer:
The number of tickets sold is 100.
Step-by-step explanation:
To find the number of tickets sold, we need to subtract the t-shirt sale revenue from the total revenue. The t-shirt sale revenue is $525. So, the ticket sale revenue would be $1525 - $525 = $1000. Since each ticket costs $10, we can find the number of tickets sold by dividing the ticket sale revenue by the ticket cost. Therefore, the number of tickets sold is $1000 / $10 = 100 tickets.