Last week, donnell practiced the piano 3 hours longer than marcus. together, marcus and donnelly practiced the piano for 11 hours. for how many hours did each young man practice the piano?

Peter applied to an accounting firm and a consulting firm. he knows that 30% of similarly qualified applicants receive job offers from the accounting firm, while only 20% of similarly qualified applicants receive job offers from the consulting firm. assume that receiving an offer from one firm is independent of receiving an offer from the other. what is the probability that both firms offer peter a job?