The half-life of Sn-121 is 10 days.If you started with 40.g of this isotope,how much would be left 30 days later?

Name: The half-life of Sn-121 is 10 days.If you started with 40.g of this isotope,how much would be left 30 days later?
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After 30 days, which is three half-lives of Sn-121 (10 days per half-life), the amount of the isotope would have halved three times. Starting with 40 g, after the first half-life, it would be 20 g; after the second, 10 g; and after the third, 5 g.

The Half-Life of Sn-121 Is 10 Days