Sarah took the advertising department from her company on a round trip to meet with a potential client. Including Sarah a total of 7 people took the trip. She was able to purchase coach tickets for ​$240 and first class tickets for ​$1140. She used her total budget for airfare for the​ trip, which was ​$4380. How many first class tickets did she​ buy? How many coach tickets did she​ buy?

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