Digital ACT Math Practice Question #1449
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32/8 = 4 half-lives. 160 -> 80 -> 40 -> 20 -> 10 grams.
Number of half-lives elapsed = 32 / 8 = 4 half-lives. Remaining mass = 160 * (1/2)^4 = 160 / 16 = 10 grams....
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