in a survey of a group of students, it was found that 60 liked to listen the poem, 45 liked to listen both and 10 did not like to

in a survey of a group of students, it was found that 60 liked to listen the poem, 45 liked to listen both and 10 did not like to listen any of them. then, how many students were surveyed?, how many liked to listen the story only?​

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