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I would like to know the answer and the solution as soon as possible! Uranium-238 (U-238) has a half-life of 4.5 billion years. Geologists find

I would like to know the answer and the solution as soon as possible!
Uranium-238 (U-238) has a half-life of 4.5 billion years. Geologists find a rock containing a mixture of U-238 and lead, and determine that 85% of the original U-238 remains; the other 15% has decayed into lead. How old is the rock (in billions of years)

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