Radioactive isotope x has been found in rock units s and q., Ask an Expert

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Radioactive isotope X has been found in rock units S and Q. Isotope X breaks down into isotope Z with a half life of 250 million years. Samples from unit Q indicate 25% parent isotope X and 75% daughter isotope Z while unit S has 6.25% parent isotope X and 93.75% daughter isotope Z. How old is unit Q and how old is unit S?

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