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A toxic radioactive substance with a density of 6 milligrams per square centimeter is detected in the ventilating ducts of a nuclear processing building that

A toxic radioactive substance with a density of 6 milligrams per square centimeter is detected in the ventilating ducts of a nuclear processing building that was used 55 years ago. If thehalf- life of the substance is 20 years, what was the density of the substance when it was deposited 55 yearsago?

The density of the radioactive substance when it was deposited 55 years ago was approximately___mg/cm2

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