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### Question Asked by a Student from EXXAMM.com Team

** Q 1251380224. ** A sample contains the number of nuclides of `Y` to be `4` times that of `X`. How much time should elapse so that the number of nuclides of `X` and `Y` become equal? Radioactive nuclides `X` and `Y` have half-lives of `30` and `10` minutes respectively.