A group of families decide to go to the amusement park. There are a total of 25 people who will be going. There are a mix of adults and children in the group. It costs $17.50 for each children's ticket and $35 for each adult ticket. Tickets for the entire group cost $536.50 in total. Let a=Number of adults. Let c=Number of children. Complete each statement. The equation that represents the total number of people is . The equation that represents the total cost of all the tickets is .