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A scientist begins with 100 mg of a radioactive substance. After 6 days, it has decayed to 60 mg. How long after the process began will it take to decay to 10 mg?
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A scientist begins with 100 mg of a radioactive substance. After 6 days, it has decayed to 60 mg. How long after the process began will it take to decay to 10 mg?

User Iuliu
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100 - 60 = 40
6 dias.......40
x...............10

40x = 60
x = 60/40
x = 6/4
x = 1,5 dia
User Silvenon
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