Question #74008
1 Answer
Nov 2, 2017
Another 15 years, for a total of 30...
Explanation:
...after 15 years, you have 50% of the original quantity. Half life is still 15 years, though, so after a further 15 years, half of the remaining quantity will disintegrate. Which is 50% of 50%, or 1/4 of the original quantity. Therefore, a total of 30 years.
GOOD LUCK
