Three strips of 2 yard wide outdoor carpet are used to cover a sidewalk. one is 3.5 yards long, the second is 25% longer than the first, and the third is 6 1/4 yard longer. how long are the 3 carpets end to end

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?