Dean High School is taking a group of students on a cruise to Puerto Rico. The total number of tickets that were purchased is 90. There needs to be a ratio of 5:1 students to adults. Please answer the 3 questions

How many Students are going?
How many Adults are going?
There are other schools from Holyoke going on the cruise too. If the cruise ship holds a maximum of 400 passengers and each school gets the same number of tickets, how many schools can come on the cruise?