The density of the substance when it was deposited 55 years ago, if a toxic radioactive substance with a density of 3 milligrams per square centimeter is detected in the ventilating ducts of a nuclear processing building that was used 55 years ago, where the half-life of the substance is 20 years.

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Chapter 9.C, Problem 45E

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The density of the substance when it was deposited $55$ years ago, if a toxic radioactive substance with a density of $3$ milligrams per square centimeter is detected in the ventilating ducts of a nuclear processing building that was used $55$ years ago, where the half-life of the substance is $20$ years.

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