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Alyx_da_Boss
Iodine-131 has a half-life of 8.10 days. In how many days will 50 grams of Iodine-131 decay to one-eighth of its original amount? 24.3 32.4 40.5 48.6 I think it's the first one.
multiply the number of half-life 8.1 by 3
the number after a decimal should be three, other than that, it's not an answer