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The half-life of Co-60 is 5.27 years.

The time interval is 104.7 min = 0.0002 years approx which is 0.000038 half lives.

So amount left = 9.9997 mg, approx.

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Q: How many milligrams of Co-60 remain after 104.7 min if you start with 10.0 mg of Co-60?
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