SOLUTION: The half 僕ife of the radioactive isotope gallium-70 is 20 minutes. If the initial amount of the gallium -70 is 25 mg, when will 10 mg be left?

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Question 892639: The half 僕ife of the radioactive isotope gallium-70 is 20 minutes. If the initial amount of the gallium -70 is 25 mg, when will 10 mg be left?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Another recently solved problem on exponential decay will help you to learn to understand the one you asked. Both your current question and that recently solved example deal with half-life.
Here is a link to that problem and its solution:
http://www.algebra.com/algebra/homework/Exponential-and-logarithmic-functions/Exponential-and-logarithmic-functions.faq.question.892641.html

When you understand the solution process, you will know what to do with question 892639, your current question.