You've determined that 45 tickets at $1.50 equals $67.50, which is 60% of the revenue. Now you just need to determine the total revenue generated, how many tickets sold at $2.50 equals the difference between $67.50 and the total revenue, then add that amount of tickets to the 45 sold at $1.50. A book store is hosting a special night in which families can enjoy a story and craft time. Tickets to the event must be bought ahead of time and are $1.50 for children and $2.50 for adults. So far, 45 children's tickets have been sold, which is 60% of the total tickets sold. How many tickets have been sold so far? Show or explain how you got your answer.