Jan's age is 3 years less than twice tritts age. the sum of their ages is 30. find their ages

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The ratio of rock songs to dance songs on jonathan’s mp3 player is 5: 6. the total number of rock and dance songs jonathan has is between 101 120. how many rock songs does he have?

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.