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The ratio of the number of times Tom exercises to the number of times Ann exercises to the number of times Mike exercises each month is 6:11:13. The total of their combined number of exercises is 90. If Tom has finished 9 exercises, Ann has finished 20 exercises and Mike has finished 19 exercises, how many exercises do each of them have left?

Tom:  exercises, 

Ann: exercises, 

Mike: exercises,