Azoo charges an admission price of $85 for the first 12 members of a group and $6 for each additional member of the group. what is the largest group that can go to the zoo and spend less than $155 on admission?

Need ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?