A sample of a radioactive substance decayed 11% over the course of 3 weeks. How many grams were in the sample originally if 30.2 6 grams of the substance were remaining after the 3 weeks?
1 answer:
Answer:
34 grams
Step-by-step explanation:
If the remaining sample has 30.26 grams of radioactive substance, and 11% of it decayed, that means that 30.26 grams is 89% of the original. Let the original be x.
30.26=0.89x
Multiply both by one hundred
3026=89x
Divide both by 89
34=x
x=original, so the original was 34 grams.
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