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After the release of radioactive material into the atmosphere from a nuclear power plant in a...

After the release of radioactive material into the atmosphere from a nuclear power plant in a country in 1982 , the hay in that country was contaminated by a radioactive isotope (half-life 6 days). If it is safe to feed the hay to cows when 12% of the radioactive isotope remains, how long did the farmers need to wait to use this hay?

The farmers needed to wait approximately------days for it to be safe to feed the hay to the cows.

​(Round to one decimal place as​ needed.)

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