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Time taken for 7/8 of a radioactive sample to disintegrate

The same question, asked 2 times: 28 Jul 2022*, 10 Apr 2023. Every wording below, oldest first.

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  1. Question 1

    28 Jul 2022

    18
    The half-life period of a radioactive substance is 60 days. The time taken for 78\frac{7}{8} th of its original mass to disintegrate will be:

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  2. Question 2

    10 Apr 2023

    92
    The half-life of a radioactive substance is TT. The time taken, for disintegrating 78\frac{7}{8} th part of its original mass will be:

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