1 Answer

Pcarvalho · Answer 1 · 2022-08-17T13:14:35+0000

Answer:

25 %

Step-by-step explanation:

20 days would mean that there are 2 half lives within that period since the half life is 10 days. After the first half life 50% of the substance remains. After another half life 0.5(50) = 25% remains

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