SOLUTION: If 100 grams of a radioactive material diminish to 80 grams in 2 years, find the half life of the substance

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Question 134076: If 100 grams of a radioactive material diminish to 80 grams in 2 years, find the half life of the substance
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
100 - 80 = 20 grams lost
20 / 2 = 50 / x
10 = 50 / x
x = 5 years