I don't know how they got the 22.5 in this problem. How did they convert 560 years to 45/2 to 22.5?
+33661 They haven't converted the time of 560 years to 22.5 grams!
The meaning of a half-life is that if you start with N grams now, then in a half-life's time you will have half of what you started with, namely half of N grams, or N/2 grams.
So if you start with 45 grams now, then in 560 years you will have 45/2 grams (22.5 grams).
.
+33661 They haven't converted the time of 560 years to 22.5 grams!
The meaning of a half-life is that if you start with N grams now, then in a half-life's time you will have half of what you started with, namely half of N grams, or N/2 grams.
So if you start with 45 grams now, then in 560 years you will have 45/2 grams (22.5 grams).
.
