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5. The half-life of 1-131 is 8.07 days. If 25 g are left after 40.35 days, how many grams
were in the original sample?
Notice that 40.35 is 5 times the half-life of 8.07 days. So in this time, the starting amount x of the sample was halved 5 times until 25 g of it were left, meaning
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