A lab sample of X-23 is decaying and you need to know how long the sample has been left out of protection. The ratio of X-23 to X-20 is measured to be approximately 1.5% of the ratio measured in a new sample. The half-life of X-20 is 57 days. Determine how long this sample sat in the lab.
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A lab sample of X-23 is decaying and you need to know how long the sample has been left out of prote...
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