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The half life period of a radioactive material is 15 minutes. What percent will remain after 45 minutes ?

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Find the ratio of the following: 30 minutes to 45 minutes .

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If 50 minutes ago, it was 45 minutes past four O'clock, how many minutes is it until six O'clock?

In every 45 minutes, the number of nuclei of a radionuclides becomes 80 % of its number before 45 minutes, then the time (in minute) in which the number of nuclei of that nuclide becomes 64% of its initial number is