# The half-life of thorium-227 is 18.72 days. How many days are required for three-fourths of a given amount to decay? I'm not quite sure how to set it up to even start working it? help would be appreciated! Thanks!!

(1) Answers

t½=18.72days therefore t¾=18.72+½ of 18.72 we have 18.72+9.36=28.08days

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