Atotal of 412 tickets were sold for the school play. they were either adult tickets or student tickets. the number of student tickets sold were three times the number of adult tickets sold. how many adult tickets were sold ?

Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?