4. the latin club chartered a bus to travel to and participate in a state competition. the cost for each adult to ride the bus was $25 and the cost for each student to ride the bus was $15. a total of 17 people rode the bus. the total paid for the bus was $305. write a system of equations to represent the situation. then, solve to find the total number of adults and the total number of students. let a represent the number of adults and s represent the number of students.