Mathematics, 24.04.2021 02:30 nana54muller

After the release of radioactive material into the atmosphere from a nuclear power plant in a country in 1998, the hay in that country was contaminated by a radioactive isotope (half-life 7 days). If it is safe to feed the hay to cows when 9% of the radioactive isotope remains how long did the farmers need to wait to use this hay?

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