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16 July, 22:53

Grandma bakes the world's best and favorite cookies. Grandma's cookies have a half life of 2 hours. One day, Grandma baked a lot of cookies. If 2 days and 6 hours later, 2 cookies still remain, how many cookies did Grandma bake?

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  1. 16 July, 23:14
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    2 = 36 (18) t/2

    1/18 = (18) t/2

    ln (1/18) = (t/2) ln18

    2ln (1/18) = tln18

    t = 2ln (1/18) / ln18
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