How many days will it take 128 kilograms of a radioactive substance to decay to 16 kilograms if it has a half-life of 32 days?

Name: How many days will it take 128 kilograms of a radioactive substance to decay to 16 kilograms if it has a half-life of 32 days?
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Question

Quizplus · Accepted Answer

For a radioactive substance to decay from 128 kilograms to 16 kilograms, it must undergo 3 half-lives (128 →  64 → 32 → 16).
When the half-life of a radioactive substance is 32 days, then 3 half-lives would equal 96 days (3 × 32 = 96).

How Many Days Will It Take 128 Kilograms of a Radioactive