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A different parent-daughter pair in the felsic ash has a half-life of 50 million years. There is 25% of this parent still remaining. How old is the felsic ash?

A different parent-daughter pair in the felsic ash has a half-life of 50 million years. There is 25% of this parent still remaining. How old is the felsic ash?
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A different parent-daughter pair in the felsic ash has a half-life of 50 million years. There is 25% of this parent still remaining. How old is the felsic ash?

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User Vvill
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I attached an answer that I found, but I'm not sure.
A different parent-daughter pair in the felsic ash has a half-life of 50 million years-example-1
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User Roy
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