SOLUTION: The half-life of Bismuth is 5 days. Then 75% of an original amount will cease to be radioactive in 10 days. I believe that this one is true. Am I right?

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Question 32908: The half-life of Bismuth is 5 days. Then 75% of an original amount will cease to be radioactive in 10 days. I believe that this one is true. Am I right?
Answer by stanbon(29603) About Me  (Show Source):
You can put this solution on YOUR website!
Sounds right. If you start with "x" amount, after
5 days you will have x/2 remaining. After another
5 days you will have x/4 remaining. I don't think
it is correct to say that 75% remains and is not
radioactive. Fact is only 25% of the material remains
and it is all radioactive.
Cheers,
Stan H.