Solve this:
Q.23. A radioactive isotope has a half life of 10 days. If today 125 mg is left over, what was its original weight 40 days earlier?
1) 2 g
2) 600 mg
3) 1 g
4) 1.5 g
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https://www.meritnation.com/ask-answer/question/a-radioactive-isotope-having-a-half-life-of-3-days-was-re/chemical-kinetics/9365659
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