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you find a rock containing a mixture of element and lead. you determine that 20% of the orignial element remain; the other 80% decayed into leads.how old is the rock?
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you find a rock containing a mixture of element and lead. you determine that 20% of the orignial element remain; the other 80% decayed into leads.how old is the rock?

User Eric Nicholson
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4 votes

100 years I think that's it

User Stephan G
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