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If an element has a half-life of 20 million years, and there is 6.25% of it remaining in a rock, how old is that rock?

If an element has a half-life of 20 million years, and there is 6.25% of it remaining in a rock, how old is that rock?
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if an element has a half-life of 20 million years, and there is 6.25% of it remaining in a rock, how old is that rock?

User Beasone
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working out: 6.25% = 4 half lives (20x4=80ma) 80ma is how old the rock is
User Hildy
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