What proportion of 235 U was present in a rock formed 3,000 x 106 years ago, given that the present proportion of 235 U to 238 U is 140? [University of Liverpool]
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![What proportion of 235 U was present in a rock formed 3,000 × 106 years ago,
given that the present proportion of 235 U to 238 U is 140?
[University of Liverpool]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2750568e-edea-4ee3-bc26-8afd0a8d0e20%2F92980375-3965-4368-b161-1d0ca7bb6f6b%2Fmerojbc_processed.jpeg&w=3840&q=75)
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